2005-04-16 15:20:36 -07:00
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2005-05-05 16:16:16 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2005-07-05 15:00:32 -07:00
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2006-03-25 01:38:55 -08:00
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2005-04-16 15:20:36 -07:00
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2005-07-05 14:58:19 -07:00
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2005-04-16 15:20:36 -07:00
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2007-09-15 10:55:54 -07:00
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2005-04-16 15:20:36 -07:00
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 17:04:11 +09:00
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2007-11-13 21:34:06 -08:00
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2007-09-12 12:01:34 +02:00
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2005-04-16 15:20:36 -07:00
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2006-07-30 20:43:36 -07:00
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2007-03-22 11:55:17 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 17:43:59 -07:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-11 20:10:07 +00:00
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2005-04-16 15:20:36 -07:00
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2010-12-13 12:52:14 -08:00
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2010-12-14 13:01:14 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-18 03:56:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 07:14:07 +00:00
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2005-04-16 15:20:36 -07:00
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net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
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2011-01-27 14:58:42 -08:00
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net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
|
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2011-01-27 14:58:42 -08:00
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|
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|
|
|
|
|
|
|
|
|
net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
|
|
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|
2011-01-27 14:58:42 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
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2005-04-16 15:20:36 -07:00
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2009-02-01 00:45:17 -08:00
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2005-04-16 15:20:36 -07:00
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|
|
2010-12-13 12:52:14 -08:00
|
|
|
|
2010-12-14 13:01:14 -08:00
|
|
|
|
net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
|
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|
2005-04-16 15:20:36 -07:00
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2008-05-20 14:32:14 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-09 15:32:57 -07:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2005-07-05 14:55:24 -07:00
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2008-10-27 12:28:25 -07:00
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2006-07-03 00:24:54 -07:00
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2005-07-05 14:55:24 -07:00
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2006-07-03 00:24:59 -07:00
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2005-07-05 14:55:24 -07:00
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2006-07-03 00:24:59 -07:00
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2005-07-05 14:55:24 -07:00
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2006-07-03 00:24:59 -07:00
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2005-07-05 14:55:24 -07:00
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2007-12-05 21:15:05 -08:00
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2005-07-05 14:55:24 -07:00
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2007-12-05 21:15:05 -08:00
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2005-07-05 14:55:24 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 17:43:59 -07:00
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2005-04-16 15:20:36 -07:00
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[IPV4]: rt_cache_stat can be statically defined
Using __get_cpu_var(obj) is slightly faster than per_cpu_ptr(obj,
raw_smp_processor_id()).
1) Smaller code and memory use
For static and small objects, DEFINE_PER_CPU(type, object) is preferred over a
alloc_percpu() : Better and smaller code to access them, and no extra memory
(storing the pointer, and the percpu array of pointers)
x86_64 code before patch
mov 1237577(%rip),%rax # ffffffff803e5990 <rt_cache_stat>
not %rax # part of per_cpu machinery
mov %gs:0x3c,%edx # get cpu number
movslq %edx,%rdx # extend 32 bits cpu number to 64 bits
mov (%rax,%rdx,8),%rax # get the pointer for this cpu
incl 0x38(%rax)
x86_64 code after patch
mov $per_cpu__rt_cache_stat,%rdx
mov %gs:0x48,%rax # get percpu data offset
incl 0x38(%rax,%rdx,1)
2) False sharing avoidance for SMP :
For a small NR_CPUS, the array of per cpu pointers allocated in alloc_percpu()
can be <= 32 bytes. This let slab code gives a part of a cache line. If the
other part of this 64 bytes (or 128 bytes) cache line is used by a mostly
written object, we can have false sharing and expensive per_cpu_ptr() operations.
Size of rt_cache_stat is 64 bytes, so this patch is not a danger of a too big
increase of bss (in UP mode) or static per_cpu data for SMP
(PERCPU_ENOUGH_ROOM is currently 32768 bytes)
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-17 02:54:36 -08:00
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2010-05-19 22:07:23 +00:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:09 -07:00
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2010-04-20 19:06:52 -07:00
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2005-04-16 15:20:36 -07:00
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2010-04-20 19:06:52 -07:00
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2008-07-05 19:04:09 -07:00
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|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-28 20:50:55 -08:00
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2005-04-16 15:20:36 -07:00
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[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2008-08-28 01:11:25 -07:00
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2005-04-16 15:20:36 -07:00
|
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2010-02-22 17:04:49 -08:00
|
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|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2010-06-10 23:31:35 -07:00
|
|
|
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2008-02-28 20:50:55 -08:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2010-06-10 23:31:35 -07:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
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|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2008-02-28 20:50:33 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
|
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2008-08-28 01:11:25 -07:00
|
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2010-10-25 21:02:07 +00:00
|
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2005-04-16 15:20:36 -07:00
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2008-08-28 01:11:25 -07:00
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2010-10-25 21:02:07 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2008-02-28 20:50:33 -08:00
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2008-03-26 02:36:06 +09:00
|
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2010-06-10 23:31:35 -07:00
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2008-02-28 20:50:55 -08:00
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2008-02-28 20:50:33 -08:00
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2008-03-26 02:36:06 +09:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2005-04-16 15:20:36 -07:00
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|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
|
|
|
|
|
2008-03-26 02:36:06 +09:00
|
|
|
|
2008-07-05 19:04:32 -07:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
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|
2005-04-16 15:20:36 -07:00
|
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|
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|
|
|
|
|
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|
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|
|
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|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:36:06 +09:00
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2005-04-16 15:20:36 -07:00
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2008-04-24 01:02:16 -07:00
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2005-04-16 15:20:36 -07:00
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2010-04-20 19:06:52 -07:00
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2010-06-10 23:31:35 -07:00
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2010-04-20 19:06:52 -07:00
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2010-06-10 23:31:35 -07:00
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2010-12-13 12:52:14 -08:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-24 01:02:16 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2007-03-12 14:34:29 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-28 20:50:55 -08:00
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2007-10-10 02:29:29 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:55:35 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-28 20:50:55 -08:00
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2005-04-16 15:20:36 -07:00
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2008-12-29 12:23:42 +00:00
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2005-04-16 15:20:36 -07:00
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[IPV4]: rt_cache_stat can be statically defined
Using __get_cpu_var(obj) is slightly faster than per_cpu_ptr(obj,
raw_smp_processor_id()).
1) Smaller code and memory use
For static and small objects, DEFINE_PER_CPU(type, object) is preferred over a
alloc_percpu() : Better and smaller code to access them, and no extra memory
(storing the pointer, and the percpu array of pointers)
x86_64 code before patch
mov 1237577(%rip),%rax # ffffffff803e5990 <rt_cache_stat>
not %rax # part of per_cpu machinery
mov %gs:0x3c,%edx # get cpu number
movslq %edx,%rdx # extend 32 bits cpu number to 64 bits
mov (%rax,%rdx,8),%rax # get the pointer for this cpu
incl 0x38(%rax)
x86_64 code after patch
mov $per_cpu__rt_cache_stat,%rdx
mov %gs:0x48,%rax # get percpu data offset
incl 0x38(%rax,%rdx,1)
2) False sharing avoidance for SMP :
For a small NR_CPUS, the array of per cpu pointers allocated in alloc_percpu()
can be <= 32 bytes. This let slab code gives a part of a cache line. If the
other part of this 64 bytes (or 128 bytes) cache line is used by a mostly
written object, we can have false sharing and expensive per_cpu_ptr() operations.
Size of rt_cache_stat is 64 bytes, so this patch is not a danger of a too big
increase of bss (in UP mode) or static per_cpu data for SMP
(PERCPU_ENOUGH_ROOM is currently 32768 bytes)
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-17 02:54:36 -08:00
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2005-04-16 15:20:36 -07:00
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2008-12-29 12:23:42 +00:00
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2005-04-16 15:20:36 -07:00
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[IPV4]: rt_cache_stat can be statically defined
Using __get_cpu_var(obj) is slightly faster than per_cpu_ptr(obj,
raw_smp_processor_id()).
1) Smaller code and memory use
For static and small objects, DEFINE_PER_CPU(type, object) is preferred over a
alloc_percpu() : Better and smaller code to access them, and no extra memory
(storing the pointer, and the percpu array of pointers)
x86_64 code before patch
mov 1237577(%rip),%rax # ffffffff803e5990 <rt_cache_stat>
not %rax # part of per_cpu machinery
mov %gs:0x3c,%edx # get cpu number
movslq %edx,%rdx # extend 32 bits cpu number to 64 bits
mov (%rax,%rdx,8),%rax # get the pointer for this cpu
incl 0x38(%rax)
x86_64 code after patch
mov $per_cpu__rt_cache_stat,%rdx
mov %gs:0x48,%rax # get percpu data offset
incl 0x38(%rax,%rdx,1)
2) False sharing avoidance for SMP :
For a small NR_CPUS, the array of per cpu pointers allocated in alloc_percpu()
can be <= 32 bytes. This let slab code gives a part of a cache line. If the
other part of this 64 bytes (or 128 bytes) cache line is used by a mostly
written object, we can have false sharing and expensive per_cpu_ptr() operations.
Size of rt_cache_stat is 64 bytes, so this patch is not a danger of a too big
increase of bss (in UP mode) or static per_cpu data for SMP
(PERCPU_ENOUGH_ROOM is currently 32768 bytes)
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-17 02:54:36 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2005-04-28 12:16:08 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2007-03-12 14:34:29 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:55:35 -08:00
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2005-04-16 15:20:36 -07:00
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2011-01-14 13:36:42 +01:00
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2009-11-25 15:40:35 -08:00
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2007-12-05 21:13:48 -08:00
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2009-11-25 15:40:35 -08:00
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2007-12-05 21:13:48 -08:00
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2009-11-25 15:40:35 -08:00
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2007-12-05 21:13:48 -08:00
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2009-11-25 15:40:35 -08:00
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2007-12-05 21:13:48 -08:00
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2009-11-25 15:40:35 -08:00
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2007-12-05 21:13:48 -08:00
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2009-11-25 15:40:35 -08:00
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2007-12-05 21:13:48 -08:00
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2007-12-05 21:14:28 -08:00
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2008-02-28 20:51:18 -08:00
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2007-12-05 21:14:28 -08:00
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2008-02-28 14:14:25 -08:00
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2007-12-05 21:14:28 -08:00
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2011-01-14 13:36:42 +01:00
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2009-11-25 15:40:35 -08:00
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2007-12-05 21:14:28 -08:00
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2011-01-14 13:36:42 +01:00
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2007-12-05 21:14:28 -08:00
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2008-02-28 20:51:18 -08:00
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2011-01-14 13:36:42 +01:00
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2008-02-28 20:51:18 -08:00
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2010-01-17 03:32:50 +00:00
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2008-02-28 20:51:18 -08:00
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2007-12-05 21:14:28 -08:00
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2008-02-28 20:51:18 -08:00
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2007-12-05 21:14:28 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 17:07:48 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 17:07:48 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-27 12:28:25 -07:00
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2010-11-12 18:43:55 +00:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-12 18:43:55 +00:00
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2006-11-09 15:20:38 -08:00
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2010-11-12 18:43:55 +00:00
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2006-10-12 00:49:15 -07:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 23:50:25 -08:00
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2010-06-10 23:31:35 -07:00
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2008-01-22 23:50:25 -08:00
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2008-07-05 19:04:32 -07:00
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2010-06-10 23:31:35 -07:00
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2008-07-05 19:04:32 -07:00
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2007-11-19 22:43:37 -08:00
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2010-12-19 21:11:20 -08:00
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2007-11-19 22:43:37 -08:00
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2010-12-19 21:11:20 -08:00
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2007-11-19 22:43:37 -08:00
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2010-10-25 21:02:07 +00:00
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2007-11-19 22:43:37 -08:00
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2008-07-05 19:06:12 -07:00
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2010-12-19 21:11:20 -08:00
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2010-10-25 21:02:07 +00:00
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2008-07-05 19:06:12 -07:00
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2010-12-19 21:11:20 -08:00
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2008-07-05 19:06:12 -07:00
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2010-12-19 21:11:20 -08:00
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2008-07-05 19:06:12 -07:00
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2010-12-19 21:11:20 -08:00
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2008-07-05 19:06:12 -07:00
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2010-12-19 21:11:20 -08:00
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2008-07-05 19:06:12 -07:00
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2010-12-19 21:11:20 -08:00
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2007-11-19 22:43:37 -08:00
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2010-12-19 21:11:20 -08:00
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2007-11-19 22:43:37 -08:00
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2008-10-27 12:28:25 -07:00
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2010-03-08 03:20:00 +00:00
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2010-10-25 21:02:07 +00:00
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2010-03-08 03:20:00 +00:00
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2007-11-19 22:43:37 -08:00
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2005-04-16 15:20:36 -07:00
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2005-07-05 15:00:32 -07:00
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2010-10-25 21:02:07 +00:00
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2009-05-19 18:54:22 +00:00
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2008-10-27 12:28:25 -07:00
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2009-06-11 20:10:07 +00:00
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2005-07-05 15:00:32 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-11 20:10:07 +00:00
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2005-07-05 15:00:32 -07:00
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2007-09-15 10:55:54 -07:00
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2005-07-05 15:00:32 -07:00
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2005-04-16 15:20:36 -07:00
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2009-05-19 18:54:22 +00:00
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2005-04-16 15:20:36 -07:00
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2007-11-14 16:14:05 -08:00
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2008-10-27 12:28:25 -07:00
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2010-10-25 21:02:07 +00:00
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2005-07-05 15:00:32 -07:00
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2009-05-19 18:54:22 +00:00
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2007-09-15 10:55:54 -07:00
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2010-10-25 21:02:07 +00:00
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2010-06-10 23:31:35 -07:00
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2008-07-05 19:04:32 -07:00
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2010-06-10 23:31:35 -07:00
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[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
|
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|
net: fix rtable leak in net/ipv4/route.c
Alexander V. Lukyanov found a regression in 2.6.29 and made a complete
analysis found in http://bugzilla.kernel.org/show_bug.cgi?id=13339
Quoted here because its a perfect one :
begin_of_quotation
2.6.29 patch has introduced flexible route cache rebuilding. Unfortunately the
patch has at least one critical flaw, and another problem.
rt_intern_hash calculates rthi pointer, which is later used for new entry
insertion. The same loop calculates cand pointer which is used to clean the
list. If the pointers are the same, rtable leak occurs, as first the cand is
removed then the new entry is appended to it.
This leak leads to unregister_netdevice problem (usage count > 0).
Another problem of the patch is that it tries to insert the entries in certain
order, to facilitate counting of entries distinct by all but QoS parameters.
Unfortunately, referencing an existing rtable entry moves it to list beginning,
to speed up further lookups, so the carefully built order is destroyed.
For the first problem the simplest patch it to set rthi=0 when rthi==cand, but
it will also destroy the ordering.
end_of_quotation
Problematic commit is 1080d709fb9d8cd4392f93476ee46a9d6ea05a5b
(net: implement emergency route cache rebulds when gc_elasticity is exceeded)
Trying to keep dst_entries ordered is too complex and breaks the fact that
order should depend on the frequency of use for garbage collection.
A possible fix is to make rt_intern_hash() simpler, and only makes
rt_check_expire() a litle bit smarter, being able to cope with an arbitrary
entries order. The added loop is running on cache hot data, while cpu
is prefetching next object, so should be unnoticied.
Reported-and-analyzed-by: Alexander V. Lukyanov <lav@yar.ru>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 20:14:28 +00:00
|
|
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2005-04-16 15:20:36 -07:00
|
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2010-06-10 23:31:35 -07:00
|
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2008-10-27 12:28:25 -07:00
|
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|
net: fix rtable leak in net/ipv4/route.c
Alexander V. Lukyanov found a regression in 2.6.29 and made a complete
analysis found in http://bugzilla.kernel.org/show_bug.cgi?id=13339
Quoted here because its a perfect one :
begin_of_quotation
2.6.29 patch has introduced flexible route cache rebuilding. Unfortunately the
patch has at least one critical flaw, and another problem.
rt_intern_hash calculates rthi pointer, which is later used for new entry
insertion. The same loop calculates cand pointer which is used to clean the
list. If the pointers are the same, rtable leak occurs, as first the cand is
removed then the new entry is appended to it.
This leak leads to unregister_netdevice problem (usage count > 0).
Another problem of the patch is that it tries to insert the entries in certain
order, to facilitate counting of entries distinct by all but QoS parameters.
Unfortunately, referencing an existing rtable entry moves it to list beginning,
to speed up further lookups, so the carefully built order is destroyed.
For the first problem the simplest patch it to set rthi=0 when rthi==cand, but
it will also destroy the ordering.
end_of_quotation
Problematic commit is 1080d709fb9d8cd4392f93476ee46a9d6ea05a5b
(net: implement emergency route cache rebulds when gc_elasticity is exceeded)
Trying to keep dst_entries ordered is too complex and breaks the fact that
order should depend on the frequency of use for garbage collection.
A possible fix is to make rt_intern_hash() simpler, and only makes
rt_check_expire() a litle bit smarter, being able to cope with an arbitrary
entries order. The added loop is running on cache hot data, while cpu
is prefetching next object, so should be unnoticied.
Reported-and-analyzed-by: Alexander V. Lukyanov <lav@yar.ru>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 20:14:28 +00:00
|
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2008-10-27 12:28:25 -07:00
|
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2010-03-08 03:20:00 +00:00
|
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2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
net: fix rtable leak in net/ipv4/route.c
Alexander V. Lukyanov found a regression in 2.6.29 and made a complete
analysis found in http://bugzilla.kernel.org/show_bug.cgi?id=13339
Quoted here because its a perfect one :
begin_of_quotation
2.6.29 patch has introduced flexible route cache rebuilding. Unfortunately the
patch has at least one critical flaw, and another problem.
rt_intern_hash calculates rthi pointer, which is later used for new entry
insertion. The same loop calculates cand pointer which is used to clean the
list. If the pointers are the same, rtable leak occurs, as first the cand is
removed then the new entry is appended to it.
This leak leads to unregister_netdevice problem (usage count > 0).
Another problem of the patch is that it tries to insert the entries in certain
order, to facilitate counting of entries distinct by all but QoS parameters.
Unfortunately, referencing an existing rtable entry moves it to list beginning,
to speed up further lookups, so the carefully built order is destroyed.
For the first problem the simplest patch it to set rthi=0 when rthi==cand, but
it will also destroy the ordering.
end_of_quotation
Problematic commit is 1080d709fb9d8cd4392f93476ee46a9d6ea05a5b
(net: implement emergency route cache rebulds when gc_elasticity is exceeded)
Trying to keep dst_entries ordered is too complex and breaks the fact that
order should depend on the frequency of use for garbage collection.
A possible fix is to make rt_intern_hash() simpler, and only makes
rt_check_expire() a litle bit smarter, being able to cope with an arbitrary
entries order. The added loop is running on cache hot data, while cpu
is prefetching next object, so should be unnoticied.
Reported-and-analyzed-by: Alexander V. Lukyanov <lav@yar.ru>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 20:14:28 +00:00
|
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2005-04-16 15:20:36 -07:00
|
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|
2010-06-10 23:31:35 -07:00
|
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|
2007-02-09 23:24:47 +09:00
|
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|
2005-04-16 15:20:36 -07:00
|
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2007-09-15 10:55:54 -07:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
|
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2007-11-19 22:43:37 -08:00
|
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|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2007-11-19 22:43:37 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2007-09-15 10:55:54 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
2005-04-16 15:20:36 -07:00
|
|
|
|
2008-07-05 19:03:31 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2008-07-05 19:04:32 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
2007-11-19 22:43:37 -08:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2008-07-05 19:00:44 -07:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2008-07-05 19:03:31 -07:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
|
|
|
2010-12-19 21:11:20 -08:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
|
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2009-11-29 15:45:58 +00:00
|
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2010-12-19 21:11:20 -08:00
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|
2009-11-29 15:45:58 +00:00
|
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|
2010-12-19 21:11:20 -08:00
|
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|
2009-11-29 15:45:58 +00:00
|
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2008-10-27 12:28:25 -07:00
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2010-05-08 01:57:52 -07:00
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2008-10-27 12:28:25 -07:00
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2010-05-08 01:57:52 -07:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-01-18 03:56:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-21 01:49:07 -08:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-21 01:49:07 -08:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2005-07-05 14:55:24 -07:00
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2010-10-25 21:02:07 +00:00
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2008-07-05 19:04:32 -07:00
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[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-05 14:55:24 -07:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-08 06:37:34 +00:00
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2005-04-16 15:20:36 -07:00
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2010-03-08 03:20:00 +00:00
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2010-10-25 21:02:07 +00:00
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2010-03-08 03:20:00 +00:00
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2009-06-02 05:14:27 +00:00
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2010-03-24 21:51:22 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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ipv4: fix NULL pointer + success return in route lookup path
Don't drop route if we're not caching
I recently got a report of an oops on a route lookup. Maxime was
testing what would happen if route caching was turned off (doing so by setting
making rt_caching always return 0), and found that it triggered an oops. I
looked at it and found that the problem stemmed from the fact that the route
lookup routines were returning success from their lookup paths (which is good),
but never set the **rp pointer to anything (which is bad). This happens because
in rt_intern_hash, if rt_caching returns false, we call rt_drop and return 0.
This almost emulates slient success. What we should be doing is assigning *rp =
rt and _not_ dropping the route. This way, during slow path lookups, when we
create a new route cache entry, we don't immediately discard it, rather we just
don't add it into the cache hash table, but we let this one lookup use it for
the purpose of this route request. Maxime has tested and reports it prevents
the oops. There is still a subsequent routing issue that I'm looking into
further, but I'm confident that, even if its related to this same path, this
patch makes sense to take.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-20 01:15:16 -07:00
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ipv4 routing: Ensure that route cache entries are usable and reclaimable with caching is off
When route caching is disabled (rt_caching returns false), We still use route
cache entries that are created and passed into rt_intern_hash once. These
routes need to be made usable for the one call path that holds a reference to
them, and they need to be reclaimed when they're finished with their use. To be
made usable, they need to be associated with a neighbor table entry (which they
currently are not), otherwise iproute_finish2 just discards the packet, since we
don't know which L2 peer to send the packet to. To do this binding, we need to
follow the path a bit higher up in rt_intern_hash, which calls
arp_bind_neighbour, but not assign the route entry to the hash table.
Currently, if caching is off, we simply assign the route to the rp pointer and
are reutrn success. This patch associates us with a neighbor entry first.
Secondly, we need to make sure that any single use routes like this are known to
the garbage collector when caching is off. If caching is off, and we try to
hash in a route, it will leak when its refcount reaches zero. To avoid this,
this patch calls rt_free on the route cache entry passed into rt_intern_hash.
This places us on the gc list for the route cache garbage collector, so that
when its refcount reaches zero, it will be reclaimed (Thanks to Alexey for this
suggestion).
I've tested this on a local system here, and with these patches in place, I'm
able to maintain routed connectivity to remote systems, even if I set
/proc/sys/net/ipv4/rt_cache_rebuild_count to -1, which forces rt_caching to
return false.
Signed-off-by: Neil Horman <nhorman@redhat.com>
Reported-by: Jarek Poplawski <jarkao2@gmail.com>
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22 10:18:53 +00:00
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2010-10-15 05:44:11 +00:00
|
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|
ipv4: fix NULL pointer + success return in route lookup path
Don't drop route if we're not caching
I recently got a report of an oops on a route lookup. Maxime was
testing what would happen if route caching was turned off (doing so by setting
making rt_caching always return 0), and found that it triggered an oops. I
looked at it and found that the problem stemmed from the fact that the route
lookup routines were returning success from their lookup paths (which is good),
but never set the **rp pointer to anything (which is bad). This happens because
in rt_intern_hash, if rt_caching returns false, we call rt_drop and return 0.
This almost emulates slient success. What we should be doing is assigning *rp =
rt and _not_ dropping the route. This way, during slow path lookups, when we
create a new route cache entry, we don't immediately discard it, rather we just
don't add it into the cache hash table, but we let this one lookup use it for
the purpose of this route request. Maxime has tested and reports it prevents
the oops. There is still a subsequent routing issue that I'm looking into
further, but I'm confident that, even if its related to this same path, this
patch makes sense to take.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-20 01:15:16 -07:00
|
|
|
|
ipv4 routing: Ensure that route cache entries are usable and reclaimable with caching is off
When route caching is disabled (rt_caching returns false), We still use route
cache entries that are created and passed into rt_intern_hash once. These
routes need to be made usable for the one call path that holds a reference to
them, and they need to be reclaimed when they're finished with their use. To be
made usable, they need to be associated with a neighbor table entry (which they
currently are not), otherwise iproute_finish2 just discards the packet, since we
don't know which L2 peer to send the packet to. To do this binding, we need to
follow the path a bit higher up in rt_intern_hash, which calls
arp_bind_neighbour, but not assign the route entry to the hash table.
Currently, if caching is off, we simply assign the route to the rp pointer and
are reutrn success. This patch associates us with a neighbor entry first.
Secondly, we need to make sure that any single use routes like this are known to
the garbage collector when caching is off. If caching is off, and we try to
hash in a route, it will leak when its refcount reaches zero. To avoid this,
this patch calls rt_free on the route cache entry passed into rt_intern_hash.
This places us on the gc list for the route cache garbage collector, so that
when its refcount reaches zero, it will be reclaimed (Thanks to Alexey for this
suggestion).
I've tested this on a local system here, and with these patches in place, I'm
able to maintain routed connectivity to remote systems, even if I set
/proc/sys/net/ipv4/rt_cache_rebuild_count to -1, which forces rt_caching to
return false.
Signed-off-by: Neil Horman <nhorman@redhat.com>
Reported-by: Jarek Poplawski <jarkao2@gmail.com>
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22 10:18:53 +00:00
|
|
|
|
net: introduce DST_NOCACHE flag
While doing stress tests with IP route cache disabled, and multi queue
devices, I noticed a very high contention on one rwlock used in
neighbour code.
When many cpus are trying to send frames (possibly using a high
performance multiqueue device) to the same neighbour, they fight for the
neigh->lock rwlock in order to call neigh_hh_init(), and fight on
hh->hh_refcnt (a pair of atomic_inc/atomic_dec_and_test())
But we dont need to call neigh_hh_init() for dst that are used only
once. It costs four atomic operations at least, on two contended cache
lines, plus the high contention on neigh->lock rwlock.
Introduce a new dst flag, DST_NOCACHE, that is set when dst was not
inserted in route cache.
With the stress test bench, sending 160000000 frames on one neighbour,
results are :
Before patch:
real 2m28.406s
user 0m11.781s
sys 36m17.964s
After patch:
real 1m26.532s
user 0m12.185s
sys 20m3.903s
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-03 22:17:54 -07:00
|
|
|
|
2010-11-11 17:07:48 -08:00
|
|
|
|
2010-06-10 23:31:35 -07:00
|
|
|
|
ipv4 routing: Ensure that route cache entries are usable and reclaimable with caching is off
When route caching is disabled (rt_caching returns false), We still use route
cache entries that are created and passed into rt_intern_hash once. These
routes need to be made usable for the one call path that holds a reference to
them, and they need to be reclaimed when they're finished with their use. To be
made usable, they need to be associated with a neighbor table entry (which they
currently are not), otherwise iproute_finish2 just discards the packet, since we
don't know which L2 peer to send the packet to. To do this binding, we need to
follow the path a bit higher up in rt_intern_hash, which calls
arp_bind_neighbour, but not assign the route entry to the hash table.
Currently, if caching is off, we simply assign the route to the rp pointer and
are reutrn success. This patch associates us with a neighbor entry first.
Secondly, we need to make sure that any single use routes like this are known to
the garbage collector when caching is off. If caching is off, and we try to
hash in a route, it will leak when its refcount reaches zero. To avoid this,
this patch calls rt_free on the route cache entry passed into rt_intern_hash.
This places us on the gc list for the route cache garbage collector, so that
when its refcount reaches zero, it will be reclaimed (Thanks to Alexey for this
suggestion).
I've tested this on a local system here, and with these patches in place, I'm
able to maintain routed connectivity to remote systems, even if I set
/proc/sys/net/ipv4/rt_cache_rebuild_count to -1, which forces rt_caching to
return false.
Signed-off-by: Neil Horman <nhorman@redhat.com>
Reported-by: Jarek Poplawski <jarkao2@gmail.com>
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22 10:18:53 +00:00
|
|
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|
|
2010-10-15 05:44:11 +00:00
|
|
|
|
ipv4 routing: Ensure that route cache entries are usable and reclaimable with caching is off
When route caching is disabled (rt_caching returns false), We still use route
cache entries that are created and passed into rt_intern_hash once. These
routes need to be made usable for the one call path that holds a reference to
them, and they need to be reclaimed when they're finished with their use. To be
made usable, they need to be associated with a neighbor table entry (which they
currently are not), otherwise iproute_finish2 just discards the packet, since we
don't know which L2 peer to send the packet to. To do this binding, we need to
follow the path a bit higher up in rt_intern_hash, which calls
arp_bind_neighbour, but not assign the route entry to the hash table.
Currently, if caching is off, we simply assign the route to the rp pointer and
are reutrn success. This patch associates us with a neighbor entry first.
Secondly, we need to make sure that any single use routes like this are known to
the garbage collector when caching is off. If caching is off, and we try to
hash in a route, it will leak when its refcount reaches zero. To avoid this,
this patch calls rt_free on the route cache entry passed into rt_intern_hash.
This places us on the gc list for the route cache garbage collector, so that
when its refcount reaches zero, it will be reclaimed (Thanks to Alexey for this
suggestion).
I've tested this on a local system here, and with these patches in place, I'm
able to maintain routed connectivity to remote systems, even if I set
/proc/sys/net/ipv4/rt_cache_rebuild_count to -1, which forces rt_caching to
return false.
Signed-off-by: Neil Horman <nhorman@redhat.com>
Reported-by: Jarek Poplawski <jarkao2@gmail.com>
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22 10:18:53 +00:00
|
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2008-10-27 12:28:25 -07:00
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|
2005-04-16 15:20:36 -07:00
|
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|
2005-07-05 14:55:24 -07:00
|
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|
|
2010-10-25 21:02:07 +00:00
|
|
|
|
|
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|
|
2008-07-05 19:04:32 -07:00
|
|
|
|
2010-06-10 23:31:35 -07:00
|
|
|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2008-01-22 23:50:25 -08:00
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|
2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-07-05 14:55:24 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-02 05:14:27 +00:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-27 12:28:25 -07:00
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2010-03-08 03:20:00 +00:00
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2010-06-10 23:31:35 -07:00
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2008-10-27 12:28:25 -07:00
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2010-03-24 07:43:17 +00:00
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2008-10-27 12:28:25 -07:00
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2010-06-10 23:31:35 -07:00
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2008-10-27 12:28:25 -07:00
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2010-03-24 07:43:17 +00:00
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2010-03-24 21:51:22 +00:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 17:07:48 -08:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-05 14:55:24 -07:00
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2005-04-16 15:20:36 -07:00
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2008-01-18 03:56:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-09-27 15:02:18 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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ipv4 routing: Ensure that route cache entries are usable and reclaimable with caching is off
When route caching is disabled (rt_caching returns false), We still use route
cache entries that are created and passed into rt_intern_hash once. These
routes need to be made usable for the one call path that holds a reference to
them, and they need to be reclaimed when they're finished with their use. To be
made usable, they need to be associated with a neighbor table entry (which they
currently are not), otherwise iproute_finish2 just discards the packet, since we
don't know which L2 peer to send the packet to. To do this binding, we need to
follow the path a bit higher up in rt_intern_hash, which calls
arp_bind_neighbour, but not assign the route entry to the hash table.
Currently, if caching is off, we simply assign the route to the rp pointer and
are reutrn success. This patch associates us with a neighbor entry first.
Secondly, we need to make sure that any single use routes like this are known to
the garbage collector when caching is off. If caching is off, and we try to
hash in a route, it will leak when its refcount reaches zero. To avoid this,
this patch calls rt_free on the route cache entry passed into rt_intern_hash.
This places us on the gc list for the route cache garbage collector, so that
when its refcount reaches zero, it will be reclaimed (Thanks to Alexey for this
suggestion).
I've tested this on a local system here, and with these patches in place, I'm
able to maintain routed connectivity to remote systems, even if I set
/proc/sys/net/ipv4/rt_cache_rebuild_count to -1, which forces rt_caching to
return false.
Signed-off-by: Neil Horman <nhorman@redhat.com>
Reported-by: Jarek Poplawski <jarkao2@gmail.com>
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22 10:18:53 +00:00
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2010-06-10 23:31:35 -07:00
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2008-10-31 00:53:57 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-16 14:18:29 -07:00
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net: fix rtable leak in net/ipv4/route.c
Alexander V. Lukyanov found a regression in 2.6.29 and made a complete
analysis found in http://bugzilla.kernel.org/show_bug.cgi?id=13339
Quoted here because its a perfect one :
begin_of_quotation
2.6.29 patch has introduced flexible route cache rebuilding. Unfortunately the
patch has at least one critical flaw, and another problem.
rt_intern_hash calculates rthi pointer, which is later used for new entry
insertion. The same loop calculates cand pointer which is used to clean the
list. If the pointers are the same, rtable leak occurs, as first the cand is
removed then the new entry is appended to it.
This leak leads to unregister_netdevice problem (usage count > 0).
Another problem of the patch is that it tries to insert the entries in certain
order, to facilitate counting of entries distinct by all but QoS parameters.
Unfortunately, referencing an existing rtable entry moves it to list beginning,
to speed up further lookups, so the carefully built order is destroyed.
For the first problem the simplest patch it to set rthi=0 when rthi==cand, but
it will also destroy the ordering.
end_of_quotation
Problematic commit is 1080d709fb9d8cd4392f93476ee46a9d6ea05a5b
(net: implement emergency route cache rebulds when gc_elasticity is exceeded)
Trying to keep dst_entries ordered is too complex and breaks the fact that
order should depend on the frequency of use for garbage collection.
A possible fix is to make rt_intern_hash() simpler, and only makes
rt_check_expire() a litle bit smarter, being able to cope with an arbitrary
entries order. The added loop is running on cache hot data, while cpu
is prefetching next object, so should be unnoticied.
Reported-and-analyzed-by: Alexander V. Lukyanov <lav@yar.ru>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 20:14:28 +00:00
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2008-10-27 12:28:25 -07:00
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2005-07-05 14:55:24 -07:00
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ipv4: fix NULL pointer + success return in route lookup path
Don't drop route if we're not caching
I recently got a report of an oops on a route lookup. Maxime was
testing what would happen if route caching was turned off (doing so by setting
making rt_caching always return 0), and found that it triggered an oops. I
looked at it and found that the problem stemmed from the fact that the route
lookup routines were returning success from their lookup paths (which is good),
but never set the **rp pointer to anything (which is bad). This happens because
in rt_intern_hash, if rt_caching returns false, we call rt_drop and return 0.
This almost emulates slient success. What we should be doing is assigning *rp =
rt and _not_ dropping the route. This way, during slow path lookups, when we
create a new route cache entry, we don't immediately discard it, rather we just
don't add it into the cache hash table, but we let this one lookup use it for
the purpose of this route request. Maxime has tested and reports it prevents
the oops. There is still a subsequent routing issue that I'm looking into
further, but I'm confident that, even if its related to this same path, this
patch makes sense to take.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-20 01:15:16 -07:00
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|
ipv4 routing: Ensure that route cache entries are usable and reclaimable with caching is off
When route caching is disabled (rt_caching returns false), We still use route
cache entries that are created and passed into rt_intern_hash once. These
routes need to be made usable for the one call path that holds a reference to
them, and they need to be reclaimed when they're finished with their use. To be
made usable, they need to be associated with a neighbor table entry (which they
currently are not), otherwise iproute_finish2 just discards the packet, since we
don't know which L2 peer to send the packet to. To do this binding, we need to
follow the path a bit higher up in rt_intern_hash, which calls
arp_bind_neighbour, but not assign the route entry to the hash table.
Currently, if caching is off, we simply assign the route to the rp pointer and
are reutrn success. This patch associates us with a neighbor entry first.
Secondly, we need to make sure that any single use routes like this are known to
the garbage collector when caching is off. If caching is off, and we try to
hash in a route, it will leak when its refcount reaches zero. To avoid this,
this patch calls rt_free on the route cache entry passed into rt_intern_hash.
This places us on the gc list for the route cache garbage collector, so that
when its refcount reaches zero, it will be reclaimed (Thanks to Alexey for this
suggestion).
I've tested this on a local system here, and with these patches in place, I'm
able to maintain routed connectivity to remote systems, even if I set
/proc/sys/net/ipv4/rt_cache_rebuild_count to -1, which forces rt_caching to
return false.
Signed-off-by: Neil Horman <nhorman@redhat.com>
Reported-by: Jarek Poplawski <jarkao2@gmail.com>
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22 10:18:53 +00:00
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2009-06-02 05:14:27 +00:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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inet: Create a mechanism for upward inetpeer propagation into routes.
If we didn't have a routing cache, we would not be able to properly
propagate certain kinds of dynamic path attributes, for example
PMTU information and redirects.
The reason is that if we didn't have a routing cache, then there would
be no way to lookup all of the active cached routes hanging off of
sockets, tunnels, IPSEC bundles, etc.
Consider the case where we created a cached route, but no inetpeer
entry existed and also we were not asked to pre-COW the route metrics
and therefore did not force the creation a new inetpeer entry.
If we later get a PMTU message, or a redirect, and store this
information in a new inetpeer entry, there is no way to teach that
cached route about the newly existing inetpeer entry.
The facilities implemented here handle this problem.
First we create a generation ID. When we create a cached route of any
kind, we remember the generation ID at the time of attachment. Any
time we force-create an inetpeer entry in response to new path
information, we bump that generation ID.
The dst_ops->check() callback is where the knowledge of this event
is propagated. If the global generation ID does not equal the one
stored in the cached route, and the cached route has not attached
to an inetpeer yet, we look it up and attach if one is found. Now
that we've updated the cached route's information, we update the
route's generation ID too.
This clears the way for implementing PMTU and redirects directly in
the inetpeer cache. There is absolutely no need to consult cached
route information in order to maintain this information.
At this point nothing bumps the inetpeer genids, that comes in the
later changes which handle PMTUs and redirects using inetpeers.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-07 20:38:06 -08:00
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2005-04-16 15:20:36 -07:00
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2010-11-30 11:54:19 -08:00
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2005-04-16 15:20:36 -07:00
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2010-08-19 06:10:45 +00:00
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2005-04-16 15:20:36 -07:00
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|
inet: Create a mechanism for upward inetpeer propagation into routes.
If we didn't have a routing cache, we would not be able to properly
propagate certain kinds of dynamic path attributes, for example
PMTU information and redirects.
The reason is that if we didn't have a routing cache, then there would
be no way to lookup all of the active cached routes hanging off of
sockets, tunnels, IPSEC bundles, etc.
Consider the case where we created a cached route, but no inetpeer
entry existed and also we were not asked to pre-COW the route metrics
and therefore did not force the creation a new inetpeer entry.
If we later get a PMTU message, or a redirect, and store this
information in a new inetpeer entry, there is no way to teach that
cached route about the newly existing inetpeer entry.
The facilities implemented here handle this problem.
First we create a generation ID. When we create a cached route of any
kind, we remember the generation ID at the time of attachment. Any
time we force-create an inetpeer entry in response to new path
information, we bump that generation ID.
The dst_ops->check() callback is where the knowledge of this event
is propagated. If the global generation ID does not equal the one
stored in the cached route, and the cached route has not attached
to an inetpeer yet, we look it up and attach if one is found. Now
that we've updated the cached route's information, we update the
route's generation ID too.
This clears the way for implementing PMTU and redirects directly in
the inetpeer cache. There is absolutely no need to consult cached
route information in order to maintain this information.
At this point nothing bumps the inetpeer genids, that comes in the
later changes which handle PMTUs and redirects using inetpeers.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-07 20:38:06 -08:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 22:15:01 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-19 22:39:42 -07:00
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2005-04-16 15:20:36 -07:00
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2010-07-09 21:22:10 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2005-04-16 15:20:36 -07:00
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[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2005-07-05 14:55:24 -07:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2008-07-05 19:04:32 -07:00
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2010-06-10 23:31:35 -07:00
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|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2005-04-16 15:20:36 -07:00
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|
2010-06-10 23:31:35 -07:00
|
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|
|
[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2005-07-05 14:55:24 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-07 21:49:44 -07:00
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2006-09-26 21:25:43 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-07 21:49:44 -07:00
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2010-10-25 21:02:07 +00:00
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2006-09-26 21:25:43 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-30 20:43:36 -07:00
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2008-02-28 20:50:06 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-25 21:47:49 +09:00
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2009-11-23 10:41:23 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-28 20:50:06 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:09 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2010-10-25 21:02:07 +00:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 17:07:48 -08:00
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2008-07-05 19:04:32 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2008-10-28 13:24:06 -07:00
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2010-06-10 23:31:35 -07:00
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2008-10-28 13:24:06 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2010-06-10 23:31:35 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2010-03-24 21:51:22 +00:00
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2005-04-16 15:20:36 -07:00
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2008-10-31 00:53:57 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-07 21:49:44 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-05 18:30:47 -08:00
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2005-04-16 15:20:36 -07:00
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2010-03-18 23:20:20 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2006-09-26 21:26:19 -07:00
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2008-07-05 19:04:09 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-31 00:53:57 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-02 05:14:27 +00:00
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2009-08-28 23:52:01 -07:00
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2011-02-04 15:55:25 -08:00
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2009-08-28 23:52:01 -07:00
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2005-04-16 15:20:36 -07:00
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2009-08-28 23:52:01 -07:00
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2010-06-10 23:31:35 -07:00
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2009-08-28 23:52:01 -07:00
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2005-04-16 15:20:36 -07:00
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2009-08-28 23:52:01 -07:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2009-08-28 23:52:01 -07:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2006-12-18 00:26:35 -08:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2009-08-28 23:52:01 -07:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-31 00:53:57 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-02 05:14:27 +00:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2008-07-16 20:20:11 -07:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2011-02-04 15:55:25 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2005-11-29 16:21:38 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 23:50:25 -08:00
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2008-04-29 03:32:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 03:32:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 03:32:25 -07:00
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2006-09-26 22:15:01 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 03:32:25 -07:00
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2008-07-05 19:04:09 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 03:32:25 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 03:32:25 -07:00
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2010-11-11 17:07:48 -08:00
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2010-06-10 23:31:35 -07:00
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2008-07-26 17:51:06 -07:00
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2008-04-29 03:32:25 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 03:32:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-06 02:33:49 -07:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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inet: Create a mechanism for upward inetpeer propagation into routes.
If we didn't have a routing cache, we would not be able to properly
propagate certain kinds of dynamic path attributes, for example
PMTU information and redirects.
The reason is that if we didn't have a routing cache, then there would
be no way to lookup all of the active cached routes hanging off of
sockets, tunnels, IPSEC bundles, etc.
Consider the case where we created a cached route, but no inetpeer
entry existed and also we were not asked to pre-COW the route metrics
and therefore did not force the creation a new inetpeer entry.
If we later get a PMTU message, or a redirect, and store this
information in a new inetpeer entry, there is no way to teach that
cached route about the newly existing inetpeer entry.
The facilities implemented here handle this problem.
First we create a generation ID. When we create a cached route of any
kind, we remember the generation ID at the time of attachment. Any
time we force-create an inetpeer entry in response to new path
information, we bump that generation ID.
The dst_ops->check() callback is where the knowledge of this event
is propagated. If the global generation ID does not equal the one
stored in the cached route, and the cached route has not attached
to an inetpeer yet, we look it up and attach if one is found. Now
that we've updated the cached route's information, we update the
route's generation ID too.
This clears the way for implementing PMTU and redirects directly in
the inetpeer cache. There is absolutely no need to consult cached
route information in order to maintain this information.
At this point nothing bumps the inetpeer genids, that comes in the
later changes which handle PMTUs and redirects using inetpeers.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-07 20:38:06 -08:00
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2010-03-18 23:20:20 +00:00
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|
inet: Create a mechanism for upward inetpeer propagation into routes.
If we didn't have a routing cache, we would not be able to properly
propagate certain kinds of dynamic path attributes, for example
PMTU information and redirects.
The reason is that if we didn't have a routing cache, then there would
be no way to lookup all of the active cached routes hanging off of
sockets, tunnels, IPSEC bundles, etc.
Consider the case where we created a cached route, but no inetpeer
entry existed and also we were not asked to pre-COW the route metrics
and therefore did not force the creation a new inetpeer entry.
If we later get a PMTU message, or a redirect, and store this
information in a new inetpeer entry, there is no way to teach that
cached route about the newly existing inetpeer entry.
The facilities implemented here handle this problem.
First we create a generation ID. When we create a cached route of any
kind, we remember the generation ID at the time of attachment. Any
time we force-create an inetpeer entry in response to new path
information, we bump that generation ID.
The dst_ops->check() callback is where the knowledge of this event
is propagated. If the global generation ID does not equal the one
stored in the cached route, and the cached route has not attached
to an inetpeer yet, we look it up and attach if one is found. Now
that we've updated the cached route's information, we update the
route's generation ID too.
This clears the way for implementing PMTU and redirects directly in
the inetpeer cache. There is absolutely no need to consult cached
route information in order to maintain this information.
At this point nothing bumps the inetpeer genids, that comes in the
later changes which handle PMTUs and redirects using inetpeers.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-07 20:38:06 -08:00
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2010-03-18 23:20:20 +00:00
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2005-04-16 15:20:36 -07:00
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net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
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2005-04-16 15:20:36 -07:00
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2009-06-02 05:14:27 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-31 00:53:57 -07:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 21:27:54 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 17:07:48 -08:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2011-01-14 13:36:42 +01:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-12-13 12:52:14 -08:00
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2010-12-14 13:01:14 -08:00
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2011-01-27 22:01:53 -08:00
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2011-02-04 14:37:30 -08:00
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2011-01-28 14:07:16 -08:00
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2011-01-27 22:01:53 -08:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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2011-01-27 22:01:53 -08:00
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2011-01-14 13:36:42 +01:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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2010-12-14 13:01:14 -08:00
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2005-04-16 15:20:36 -07:00
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2010-12-08 21:16:57 -08:00
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2010-12-13 12:52:14 -08:00
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2010-12-08 21:16:57 -08:00
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2005-04-16 15:20:36 -07:00
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2011-01-14 13:36:42 +01:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2006-09-26 21:25:20 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 21:27:54 -07:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 12:05:27 +00:00
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2005-04-16 15:20:36 -07:00
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2008-01-21 03:18:08 -08:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 12:05:27 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2007-06-04 23:34:44 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-09 15:20:38 -08:00
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2005-04-16 15:20:36 -07:00
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2011-01-14 13:36:42 +01:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:32 -07:00
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2010-03-24 21:51:22 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2010-06-02 12:05:27 +00:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 21:25:20 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-31 00:53:57 -07:00
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2007-03-19 15:33:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-19 15:33:04 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-03 04:13:21 +00:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-03 04:13:21 +00:00
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2006-09-26 21:28:14 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-03 04:13:21 +00:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2009-10-18 02:12:33 +00:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2008-06-03 16:36:01 -07:00
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2005-04-16 15:20:36 -07:00
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2010-01-05 05:50:47 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-05 05:50:47 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2007-06-04 23:34:44 -07:00
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2010-06-10 23:31:35 -07:00
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2007-06-04 23:34:44 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-09 15:20:38 -08:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-22 22:10:23 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:32 -07:00
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2010-06-10 23:31:35 -07:00
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2010-03-24 21:51:22 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 21:25:20 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2010-11-12 18:43:55 +00:00
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2006-11-09 15:20:38 -08:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 21:25:20 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-25 21:47:49 +09:00
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2005-04-16 15:20:36 -07:00
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2008-01-21 03:18:08 -08:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2010-10-17 15:11:22 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2010-10-17 15:11:22 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2005-06-28 13:06:23 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 12:05:27 +00:00
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2010-10-05 10:41:36 +00:00
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2010-06-02 12:05:27 +00:00
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2005-04-16 15:20:36 -07:00
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2005-06-28 13:06:23 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2009-10-18 02:12:33 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 12:05:27 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2007-06-04 23:34:44 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-09 15:20:38 -08:00
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2005-04-16 15:20:36 -07:00
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2011-01-14 13:36:42 +01:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:32 -07:00
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2010-03-24 21:51:22 +00:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-07 01:07:24 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-31 00:53:57 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-28 13:06:23 -07:00
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2007-02-09 23:24:47 +09:00
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2010-10-05 10:41:36 +00:00
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2005-06-28 13:06:23 -07:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 12:05:27 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-05-10 11:32:55 +00:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 23:50:25 -08:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2008-03-25 21:47:49 +09:00
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2008-10-27 12:28:25 -07:00
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2010-06-02 19:21:31 +00:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2010-04-20 19:06:52 -07:00
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2008-04-10 04:00:28 -07:00
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2006-11-09 15:20:38 -08:00
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2010-06-10 23:31:35 -07:00
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2008-07-05 19:04:32 -07:00
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2010-05-10 11:32:55 +00:00
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2010-06-10 23:31:35 -07:00
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2010-05-10 11:32:55 +00:00
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2010-06-10 23:31:35 -07:00
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2010-05-10 11:32:55 +00:00
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2005-04-16 15:20:36 -07:00
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2008-10-27 12:28:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2009-11-23 10:41:23 -08:00
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2005-04-16 15:20:36 -07:00
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2009-11-23 10:41:23 -08:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2010-06-02 19:21:31 +00:00
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2005-04-16 15:20:36 -07:00
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2010-05-10 11:32:55 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2010-09-29 11:53:50 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-17 15:11:22 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2010-10-17 15:11:22 +00:00
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2005-04-16 15:20:36 -07:00
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2010-09-29 11:53:50 +00:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-09-29 11:53:50 +00:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2010-09-29 11:53:50 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-07 14:48:38 +00:00
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2010-09-29 11:53:50 +00:00
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2010-10-07 14:48:38 +00:00
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2010-06-10 23:31:35 -07:00
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2007-06-04 23:34:44 -07:00
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2010-06-10 23:31:35 -07:00
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2007-06-04 23:34:44 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-09 15:20:38 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-09-29 11:53:50 +00:00
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2005-04-16 15:20:36 -07:00
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2010-10-05 10:41:36 +00:00
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2008-04-10 01:52:09 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-22 22:10:23 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:09 -07:00
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2008-07-05 19:04:32 -07:00
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2010-03-24 21:51:22 +00:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2010-09-30 03:33:58 +00:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 22:06:19 -08:00
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2005-04-16 15:20:36 -07:00
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2010-11-12 18:43:55 +00:00
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2006-11-09 15:20:38 -08:00
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2008-01-22 22:06:19 -08:00
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2005-04-16 15:20:36 -07:00
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2010-09-30 03:33:58 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2008-01-21 03:18:08 -08:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 22:04:30 -08:00
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2005-04-16 15:20:36 -07:00
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2009-11-23 10:41:23 -08:00
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2010-10-17 15:11:22 +00:00
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2008-10-01 07:28:28 -07:00
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2010-09-30 03:33:58 +00:00
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2008-10-01 07:28:28 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-01 07:28:28 -07:00
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2010-09-30 03:33:58 +00:00
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2008-10-01 07:28:28 -07:00
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2005-04-16 15:20:36 -07:00
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2010-09-30 03:33:58 +00:00
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2005-04-16 15:20:36 -07:00
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2005-10-03 14:35:55 -07:00
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2010-12-22 04:39:39 +00:00
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2007-12-16 13:45:43 -08:00
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2010-10-17 15:11:22 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 22:06:19 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 22:06:19 -08:00
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2005-04-16 15:20:36 -07:00
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2011-01-03 20:24:20 +00:00
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2008-01-22 22:06:19 -08:00
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2005-04-16 15:20:36 -07:00
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2011-01-31 16:16:50 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 22:06:48 -08:00
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2005-04-16 15:20:36 -07:00
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2010-09-30 03:33:58 +00:00
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2005-04-16 15:20:36 -07:00
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2008-10-27 12:28:25 -07:00
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2008-07-05 19:04:32 -07:00
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2005-04-16 15:20:36 -07:00
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2010-02-22 17:04:49 -08:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 17:07:48 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-09 15:20:38 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 23:50:25 -08:00
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2010-06-10 23:31:35 -07:00
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2008-07-05 19:04:32 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-27 12:28:25 -07:00
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2010-09-30 03:33:58 +00:00
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2005-04-16 15:20:36 -07:00
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2005-08-09 20:12:12 -07:00
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2010-09-08 14:35:43 -07:00
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2011-01-31 13:16:00 -08:00
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2007-05-24 18:17:54 -07:00
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2009-02-01 00:45:17 -08:00
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2007-05-24 18:17:54 -07:00
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2010-09-08 14:35:43 -07:00
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2011-01-31 13:16:00 -08:00
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2007-05-24 18:17:54 -07:00
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2008-07-05 19:04:32 -07:00
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2007-05-24 18:17:54 -07:00
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2010-06-10 23:31:35 -07:00
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2007-05-24 18:17:54 -07:00
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2007-11-13 21:34:06 -08:00
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2010-12-08 21:16:57 -08:00
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2007-05-24 18:17:54 -07:00
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2010-06-10 23:31:35 -07:00
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2007-05-24 18:17:54 -07:00
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2008-07-05 19:04:32 -07:00
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2007-05-24 18:17:54 -07:00
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net: Implement read-only protection and COW'ing of metrics.
Routing metrics are now copy-on-write.
Initially a route entry points it's metrics at a read-only location.
If a routing table entry exists, it will point there. Else it will
point at the all zero metric place-holder called 'dst_default_metrics'.
The writeability state of the metrics is stored in the low bits of the
metrics pointer, we have two bits left to spare if we want to store
more states.
For the initial implementation, COW is implemented simply via kmalloc.
However future enhancements will change this to place the writable
metrics somewhere else, in order to increase sharing. Very likely
this "somewhere else" will be the inetpeer cache.
Note also that this means that metrics updates may transiently fail
if we cannot COW the metrics successfully.
But even by itself, this patch should decrease memory usage and
increase cache locality especially for routing workloads. In those
cases the read-only metric copies stay in place and never get written
to.
TCP workloads where metrics get updated, and those rare cases where
PMTU triggers occur, will take a very slight performance hit. But
that hit will be alleviated when the long-term writable metrics
move to a more sharable location.
Since the metrics storage went from a u32 array of RTAX_MAX entries to
what is essentially a pointer, some retooling of the dst_entry layout
was necessary.
Most importantly, we need to preserve the alignment of the reference
count so that it doesn't share cache lines with the read-mostly state,
as per Eric Dumazet's alignment assertion checks.
The only non-trivial bit here is the move of the 'flags' member into
the writeable cacheline. This is OK since we are always accessing the
flags around the same moment when we made a modification to the
reference count.
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-26 20:51:05 -08:00
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2007-05-24 18:17:54 -07:00
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2010-06-10 23:31:35 -07:00
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2007-05-24 18:17:54 -07:00
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2010-09-22 20:43:57 +00:00
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2007-05-24 18:17:54 -07:00
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2008-01-22 22:07:10 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 22:07:10 -08:00
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2005-04-16 15:20:36 -07:00
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2008-11-25 17:35:18 -08:00
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2007-12-12 18:48:58 -08:00
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2007-05-24 18:17:54 -07:00
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2008-07-05 19:04:32 -07:00
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2007-05-24 18:17:54 -07:00
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2005-04-16 15:20:36 -07:00
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2005-08-09 20:12:12 -07:00
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2008-01-22 22:07:34 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-22 22:07:34 -08:00
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2005-04-16 15:20:36 -07:00
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2010-07-09 21:22:10 +00:00
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2005-04-16 15:20:36 -07:00
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2009-01-22 04:56:23 +00:00
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2005-06-18 22:54:12 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-02 05:14:27 +00:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2006-11-27 09:27:07 -08:00
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2006-08-17 18:15:17 -07:00
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2007-01-31 23:16:40 -08:00
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2006-08-17 18:15:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2006-09-26 22:15:25 -07:00
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2006-08-17 18:15:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 22:15:25 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2011-01-14 13:36:42 +01:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-11 17:07:48 -08:00
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2006-09-26 22:15:25 -07:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 22:15:25 -07:00
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2006-08-17 18:15:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 22:15:25 -07:00
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2006-08-17 18:15:17 -07:00
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2010-12-08 21:16:57 -08:00
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2006-08-17 18:15:17 -07:00
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2010-07-20 22:03:14 +00:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-16 04:52:13 +00:00
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2009-11-12 09:33:09 +00:00
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2005-04-16 15:20:36 -07:00
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2006-11-27 09:27:07 -08:00
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2007-03-04 16:12:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2010-11-11 17:07:48 -08:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 22:15:01 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-16 13:45:43 -08:00
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2009-01-22 04:56:23 +00:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2006-11-27 09:27:07 -08:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2006-11-27 09:27:07 -08:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:17 -07:00
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2007-01-31 23:16:40 -08:00
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2005-04-16 15:20:36 -07:00
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2007-03-22 11:55:17 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 02:26:21 +09:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 21:25:20 -07:00
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2006-08-17 18:15:44 -07:00
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2010-07-20 22:03:14 +00:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-19 15:30:44 -07:00
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2007-04-10 20:45:18 -07:00
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2006-04-17 17:27:11 -07:00
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2007-04-20 22:47:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-09-26 22:15:25 -07:00
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2006-08-17 18:15:44 -07:00
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2010-07-20 22:03:14 +00:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2008-02-28 20:52:04 -08:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2010-07-20 22:03:14 +00:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2009-06-02 05:14:27 +00:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2010-11-12 18:43:55 +00:00
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2006-08-17 18:15:44 -07:00
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2010-07-20 22:03:14 +00:00
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2006-08-17 18:15:44 -07:00
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2008-02-28 20:52:04 -08:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-22 04:56:23 +00:00
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2008-02-28 20:52:04 -08:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-28 20:52:04 -08:00
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2006-08-17 18:15:44 -07:00
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2006-08-15 00:30:25 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-17 18:15:44 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-28 20:52:04 -08:00
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2008-03-26 02:26:21 +09:00
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2005-04-16 15:20:36 -07:00
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[IPV4] ROUTE: ip_rt_dump() is unecessary slow
I noticed "ip route list cache x.y.z.t" can be *very* slow.
While strace-ing -T it I also noticed that first part of route cache
is fetched quite fast :
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"p\0\0\0\30\0\2\0\254i\202
GXm\0\0\2 \0\376\0\0\2\0\2\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3772 <0.000047>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\234\0\0\0\30\0\2\0\254i\
202GXm\0\0\2 \0\376\0\0\1\0\2"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3736 <0.000042>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\204\0\0\0\30\0\2\0\254i\
202GXm\0\0\2 \0\376\0\0\1\0\2"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3740 <0.000055>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\234\0\0\0\30\0\2\0\254i\
202GXm\0\0\2 \0\376\0\0\1\0\2"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3712 <0.000043>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\204\0\0\0\30\0\2\0\254i\
202GXm\0\0\2 \0\376\0\0\1\0\2"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3732 <0.000053>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"p\0\0\0\30\0\2\0\254i\202
GXm\0\0\2 \0\376\0\0\2\0\2\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3708 <0.000052>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"p\0\0\0\30\0\2\0\254i\202
GXm\0\0\2 \0\376\0\0\2\0\2\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3680 <0.000041>
while the part at the end of the table is more expensive:
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\204\0\0\0\30\0\2\0\254i\202GXm\0\0\2 \0\376\0\0\1\0\2"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3656 <0.003857>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\204\0\0\0\30\0\2\0\254i\202GXm\0\0\2 \0\376\0\0\1\0\2"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3772 <0.003891>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"p\0\0\0\30\0\2\0\254i\202GXm\0\0\2 \0\376\0\0\2\0\2\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3712 <0.003765>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"p\0\0\0\30\0\2\0\254i\202GXm\0\0\2 \0\376\0\0\2\0\2\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3700 <0.003879>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"p\0\0\0\30\0\2\0\254i\202GXm\0\0\2 \0\376\0\0\2\0\2\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3676 <0.003797>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"p\0\0\0\30\0\2\0\254i\202GXm\0\0\2 \0\376\0\0\2\0\2\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3724 <0.003856>
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\234\0\0\0\30\0\2\0\254i\202GXm\0\0\2 \0\376\0\0\1\0\2"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 3736 <0.003848>
The following patch corrects this performance/latency problem,
removing quadratic behavior.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-07 21:52:14 -08:00
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2005-04-16 15:20:36 -07:00
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2008-08-28 01:11:25 -07:00
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2005-04-16 15:20:36 -07:00
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2010-02-22 17:04:49 -08:00
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2010-06-10 23:31:35 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:04:32 -07:00
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[IPV4] route cache: Introduce rt_genid for smooth cache invalidation
Current ip route cache implementation is not suited to large caches.
We can consume a lot of CPU when cache must be invalidated, since we
currently need to evict all cache entries, and this eviction is
sometimes asynchronous. min_delay & max_delay can somewhat control this
asynchronism behavior, but whole thing is a kludge, regularly triggering
infamous soft lockup messages. When entries are still in use, this also
consumes a lot of ram, filling dst_garbage.list.
A better scheme is to use a generation identifier on each entry,
so that cache invalidation can be performed by changing the table
identifier, without having to scan all entries.
No more delayed flushing, no more stalling when secret_interval expires.
Invalidated entries will then be freed at GC time (controled by
ip_rt_gc_timeout or stress), or when an invalidated entry is found
in a chain when an insert is done.
Thus we keep a normal equilibrium.
This patch :
- renames rt_hash_rnd to rt_genid (and makes it an atomic_t)
- Adds a new rt_genid field to 'struct rtable' (filling a hole on 64bit)
- Checks entry->rt_genid at appropriate places :
2008-01-31 17:05:09 -08:00
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2010-06-10 23:31:35 -07:00
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2009-01-22 04:56:23 +00:00
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2007-02-09 23:24:47 +09:00
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2005-06-18 22:54:12 -07:00
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2009-06-02 05:19:30 +00:00
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2005-04-16 15:20:36 -07:00
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2009-06-02 05:19:30 +00:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:00:44 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-08 03:05:28 -07:00
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2009-09-23 15:57:19 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:02:06 -07:00
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2008-07-08 03:05:28 -07:00
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2008-07-05 19:02:33 -07:00
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2008-07-05 19:02:06 -07:00
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2008-07-08 03:05:28 -07:00
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2009-09-23 15:57:19 -07:00
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2008-07-05 19:02:06 -07:00
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2008-07-08 03:05:28 -07:00
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2008-07-05 19:02:33 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2008-07-27 08:59:33 +01:00
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2005-04-16 15:20:36 -07:00
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2008-11-03 18:21:05 -08:00
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2005-04-16 15:20:36 -07:00
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2008-11-03 18:21:05 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-09 23:24:47 +09:00
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2005-04-16 15:20:36 -07:00
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2008-11-03 18:21:05 -08:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:20:36 -07:00
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2008-11-03 18:21:05 -08:00
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2009-11-05 13:32:03 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-05 19:02:33 -07:00
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2008-08-25 15:17:44 -07:00
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2009-11-05 13:32:03 -08:00
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2008-08-27 02:35:18 -07:00
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2009-11-05 13:32:03 -08:00
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2008-08-27 02:35:18 -07:00
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2008-08-25 15:17:44 -07:00
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2008-07-05 19:02:33 -07:00
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2009-11-05 13:32:03 -08:00
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2008-08-25 15:17:44 -07:00
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2008-07-05 19:02:33 -07:00
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2008-11-03 18:21:05 -08:00
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2008-07-05 19:02:33 -07:00
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2009-11-05 13:32:03 -08:00
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2008-07-05 19:02:33 -07:00
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2009-11-05 13:32:03 -08:00
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2008-08-25 15:17:44 -07:00
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2008-07-05 19:02:33 -07:00
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2009-11-25 15:14:13 -08:00
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2008-07-05 19:02:33 -07:00
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2005-04-16 15:20:36 -07:00
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2010-05-08 01:57:52 -07:00
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2008-07-05 19:02:59 -07:00
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2010-05-08 01:57:52 -07:00
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2008-07-05 19:02:59 -07:00
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2010-05-08 01:57:52 -07:00
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2008-07-05 19:02:59 -07:00
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2011-01-14 13:36:42 +01:00
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2010-02-16 15:20:26 +00:00
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2011-01-14 13:36:42 +01:00
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2005-04-16 15:20:36 -07:00
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2005-07-05 14:58:19 -07:00
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2005-04-16 15:20:36 -07:00
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2011-01-14 13:36:42 +01:00
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2009-02-25 14:07:33 +01:00
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2005-04-16 15:20:36 -07:00
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2006-08-26 19:25:52 -07:00
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2007-07-20 10:11:58 +09:00
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2007-05-24 18:17:54 -07:00
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2010-10-08 06:37:34 +00:00
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2005-07-05 14:58:19 -07:00
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2009-09-21 17:03:05 -07:00
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[IPV4] tcp/route: Another look at hash table sizes
The tcp_ehash hash table gets too big on systems with really big memory.
It is worse on systems with pages larger than 4KB. It wastes memory that
could be better used. It also makes the netstat command slow because reading
/proc/net/tcp and /proc/net/tcp6 needs to go through the full hash table.
The default value should not be larger for larger page sizes. It seems
that the effect of page size is an unintended error dating back a long
time. I also wonder if the default value really should be a larger
fraction of memory for systems with more memory. While systems with
really big ram can afford more space for hash tables, it is not clear to
me that they benefit from increasing the allocation ratio for this table.
The amount of memory allocated is determined by net/ipv4/tcp.c:tcp_init and
mm/page_alloc.c:alloc_large_system_hash.
tcp_init calls alloc_large_system_hash passing parameters-
bucketsize=sizeof(struct tcp_ehash_bucket)
numentries=thash_entries
scale=(num_physpages >= 128 * 1024) ? (25-PAGE_SHIFT) : (27-PAGE_SHIFT)
limit=0
On i386, PAGE_SHIFT is 12 for a page size of 4K
On ia64, PAGE_SHIFT defaults to 14 for a page size of 16K
The num_physpages test above makes the allocation take a larger fraction
of the total memory on systems with larger memory. The threshold size
for a i386 system is 512MB. For an ia64 system with 16KB pages the
threshold is 2GB.
For smaller memory systems-
On i386, scale = (27 - 12) = 15
On ia64, scale = (27 - 14) = 13
For larger memory systems-
On i386, scale = (25 - 12) = 13
On ia64, scale = (25 - 14) = 11
For the rest of this discussion, I'll just track the larger memory case.
The default behavior has numentries=thash_entries=0, so the allocated
size is determined by either scale or by the default limit of 1/16 of
total memory.
In alloc_large_system_hash-
| numentries = (flags & HASH_HIGHMEM) ? nr_all_pages : nr_kernel_pages;
| numentries += (1UL << (20 - PAGE_SHIFT)) - 1;
| numentries >>= 20 - PAGE_SHIFT;
| numentries <<= 20 - PAGE_SHIFT;
At this point, numentries is pages for all of memory, rounded up to the
nearest megabyte boundary.
| /* limit to 1 bucket per 2^scale bytes of low memory */
| if (scale > PAGE_SHIFT)
| numentries >>= (scale - PAGE_SHIFT);
| else
| numentries <<= (PAGE_SHIFT - scale);
On i386, numentries >>= (13 - 12), so numentries is 1/8196 of
bytes of total memory.
On ia64, numentries <<= (14 - 11), so numentries is 1/2048 of
bytes of total memory.
| log2qty = long_log2(numentries);
|
| do {
| size = bucketsize << log2qty;
bucketsize is 16, so size is 16 times numentries, rounded
down to a power of two.
On i386, size is 1/512 of bytes of total memory.
On ia64, size is 1/128 of bytes of total memory.
For smaller systems the results are
On i386, size is 1/2048 of bytes of total memory.
On ia64, size is 1/512 of bytes of total memory.
The large page effect can be removed by just replacing
the use of PAGE_SHIFT with a constant of 12 in the calls to
alloc_large_system_hash. That makes them more like the other uses of
that function from fs/inode.c and fs/dcache.c
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-29 16:12:55 -08:00
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2006-08-07 20:44:22 -07:00
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2005-07-05 14:58:19 -07:00
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2009-04-27 05:42:24 -07:00
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2005-07-05 14:55:24 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-11 20:10:07 +00:00
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2007-09-15 10:55:54 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-28 20:51:18 -08:00
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2007-12-05 21:14:28 -08:00
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2005-04-16 15:20:36 -07:00
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2009-07-30 18:52:15 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-22 11:55:17 -07:00
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2008-07-05 19:02:33 -07:00
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2010-05-08 01:57:52 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-30 06:32:52 -04:00
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2008-07-27 08:59:33 +01:00
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2008-08-25 15:17:44 -07:00
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2008-07-27 08:59:33 +01:00
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2008-07-30 06:32:52 -04:00
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