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Michael Ellerman 8fc63a91e7 Merge branch 'smp-topo' into next 
Merge a branch containing SMP topology updates from Srikar, purely so we can
include the cover letter which has a lot of good detail here:

PowerVM systems configured in shared processors mode have some unique
challenges. Some device-tree properties will be missing on a shared
processor. Hence some sched domains may not make sense for shared processor
systems.

Most shared processor systems are over-provisioned. Underlying PowerVM
Hypervisor would schedule at a Big Core (SMT8) granularity. The most recent
power processors support two almost independent cores. In a lightly loaded
condition, it helps the overall system performance if we pack to lesser number
of Big Cores.

Since each thread-group is independent, running threads on both the
thread-groups of a SMT8 core, should have a minimal adverse impact in
non over provisioned scenarios. These changes in this patchset will not
affect in the over provisioned scenario.  If there are more threads than
SMT domains, then asym_packing will not kick-in.

System Configuration
type=Shared mode=Uncapped smt=8 lcpu=96 mem=1066409344 kB cpus=96 ent=64.00
So *64 Entitled cores/ 96 Virtual processor* Scenario

lscpu
Architecture:                       ppc64le
Byte Order:                         Little Endian
CPU(s):                             768
On-line CPU(s) list:                0-767
Model name:                         POWER10 (architected), altivec supported
Model:                              2.0 (pvr 0080 0200)
Thread(s) per core:                 8
Core(s) per socket:                 16
Socket(s):                          6
Hypervisor vendor:                  pHyp
Virtualization type:                para
L1d cache:                          6 MiB (192 instances)
L1i cache:                          9 MiB (192 instances)
NUMA node(s):                       6
NUMA node0 CPU(s):                  0-7,32-39,80-87,128-135,176-183,224-231,272-279,320-327,368-375,416-423,464-471,512-519,560-567,608-615,656-663,704-711,752-759
NUMA node1 CPU(s):                  8-15,40-47,88-95,136-143,184-191,232-239,280-287,328-335,376-383,424-431,472-479,520-527,568-575,616-623,664-671,712-719,760-767
NUMA node4 CPU(s):                  64-71,112-119,160-167,208-215,256-263,304-311,352-359,400-407,448-455,496-503,544-551,592-599,640-647,688-695,736-743
NUMA node5 CPU(s):                  16-23,48-55,96-103,144-151,192-199,240-247,288-295,336-343,384-391,432-439,480-487,528-535,576-583,624-631,672-679,720-727
NUMA node6 CPU(s):                  72-79,120-127,168-175,216-223,264-271,312-319,360-367,408-415,456-463,504-511,552-559,600-607,648-655,696-703,744-751
NUMA node7 CPU(s):                  24-31,56-63,104-111,152-159,200-207,248-255,296-303,344-351,392-399,440-447,488-495,536-543,584-591,632-639,680-687,728-735

ebizzy -t 32 -S 200 (5 iterations) Records per second. (Higher is better)
Kernel     N  Min      Max      Median   Avg        Stddev     %Change
6.6.0-rc3  5  3840178  4059268  3978042  3973936.6  84264.456
+patch     5  3768393  3927901  3874994  3854046    71532.926  -3.01692

>From lparstat (when the workload stabilized)
Kernel     %user  %sys  %wait  %idle  physc  %entc  lbusy  app    vcsw       phint
6.6.0-rc3  4.16   0.00  0.00   95.84  26.06  40.72  4.16   69.88  276906989  578
+patch     4.16   0.00  0.00   95.83  17.70  27.66  4.17   78.26  70436663   119

ebizzy -t 128 -S 200 (5 iterations) Records per second. (Higher is better)
Kernel     N Min      Max      Median   Avg        Stddev     %Change
6.6.0-rc3  5 5520692  5981856  5717709  5727053.2  176093.2
+patch     5 5305888  6259610  5854590  5843311    375917.03  2.02998

>From lparstat (when the workload stabilized)
Kernel     %user  %sys  %wait  %idle  physc  %entc  lbusy  app    vcsw       phint
6.6.0-rc3  16.66  0.00  0.00   83.33  45.49  71.08  16.67  50.50  288778533  581
+patch     16.65  0.00  0.00   83.35  30.15  47.11  16.65  65.76  85196150   133

ebizzy -t 512 -S 200 (5 iterations) Records per second. (Higher is better)
Kernel     N  Min       Max       Median    Avg       Stddev     %Change
6.6.0-rc3  5  19563921  20049955  19701510  19728733  198295.18
+patch     5  19455992  20176445  19718427  19832017  304094.05  0.523521

>From lparstat (when the workload stabilized)
%Kernel     user  %sys  %wait  %idle  physc  %entc   lbusy  app   vcsw       phint
66.6.0-rc3  6.44  0.01  0.00   33.55  94.14  147.09  66.45  1.33  313345175  621
6+patch     6.44  0.01  0.00   33.55  94.15  147.11  66.45  1.33  109193889  309

System Configuration
type=Shared mode=Uncapped smt=8 lcpu=40 mem=1067539392 kB cpus=96 ent=40.00
So *40 Entitled cores/ 40 Virtual processor* Scenario

lscpu
Architecture:                       ppc64le
Byte Order:                         Little Endian
CPU(s):                             320
On-line CPU(s) list:                0-319
Model name:                         POWER10 (architected), altivec supported
Model:                              2.0 (pvr 0080 0200)
Thread(s) per core:                 8
Core(s) per socket:                 10
Socket(s):                          4
Hypervisor vendor:                  pHyp
Virtualization type:                para
L1d cache:                          2.5 MiB (80 instances)
L1i cache:                          3.8 MiB (80 instances)
NUMA node(s):                       4
NUMA node0 CPU(s):                  0-7,32-39,64-71,96-103,128-135,160-167,192-199,224-231,256-263,288-295
NUMA node1 CPU(s):                  8-15,40-47,72-79,104-111,136-143,168-175,200-207,232-239,264-271,296-303
NUMA node4 CPU(s):                  16-23,48-55,80-87,112-119,144-151,176-183,208-215,240-247,272-279,304-311
NUMA node5 CPU(s):                  24-31,56-63,88-95,120-127,152-159,184-191,216-223,248-255,280-287,312-319

ebizzy -t 32 -S 200 (5 iterations) Records per second. (Higher is better)
Kernel     N   Min      Max      Median   Avg        Stddev     %Change
6.6.0-rc3  5   3535518  3864532  3745967  3704233.2  130216.76
+patch     5   3608385  3708026  3649379  3651596.6  37862.163  -1.42099

%Kernel    user   %sys  %wait  %idle  physc  %entc  lbusy  app    vcsw     phint
6.6.0-rc3  10.00  0.01  0.00   89.99  22.98  57.45  10.01  41.01  1135139  262
+patch     10.00  0.00  0.00   90.00  16.95  42.37  10.00  47.05  925561   19

ebizzy -t 64 -S 200 (5 iterations) Records per second. (Higher is better)
Kernel     N   Min      Max      Median   Avg        Stddev     %Change
6.6.0-rc3  5   4434984  4957281  4548786  4591298.2  211770.2
+patch     5   4461115  4835167  4544716  4607795.8  151474.85  0.359323

%Kernel    user   %sys  %wait  %idle  physc  %entc  lbusy  app    vcsw     phint
6.6.0-rc3  20.01  0.00  0.00   79.99  38.22  95.55  20.01  25.77  1287553  265
+patch     19.99  0.00  0.00   80.01  25.55  63.88  19.99  38.44  1077341  20

ebizzy -t 256 -S 200 (5 iterations) Records per second. (Higher is better)
Kernel     N   Min      Max      Median   Avg        Stddev     %Change
6.6.0-rc3  5   8850648  8982659  8951911  8936869.2  52278.031
+patch     5   8751038  9060510  8981409  8942268.4  117070.6   0.0604149

%Kernel    user   %sys  %wait  %idle  physc  %entc   lbusy  app    vcsw     phint
6.6.0-rc3  80.02  0.01  0.01   19.96  40.00  100.00  80.03  24.00  1597665  276
+patch     80.02  0.01  0.01   19.96  40.00  100.00  80.03  23.99  1383921  63

Observation:
We are able to see Improvement in ebizzy throughput even with lesser
core utilization (almost half the core utilization) in low utilization
scenarios while still retaining throughput in mid and higher utilization
scenarios.
Note: The numbers are with Uncapped + no-noise case. In the Capped and/or
noise case, due to contention on the Cores, the numbers are expected to
further improve.

Note: The numbers included (sched/fair: Enable group_asym_packing in find_idlest_group)
https://lore.kernel.org/all/20231018155036.2314342-1-srikar@linux.vnet.ibm.com/
History 2023-12-15 13:51:56 +11:00
arch Merge branch 'smp-topo' into next 2023-12-15 13:51:56 +11:00
block blk-mq: make sure active queue usage is held for bio_integrity_prep() 2023-11-13 08:52:52 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto This push fixes a regression in ahash and hides the Kconfig sub-options for the jitter RNG. 2023-11-09 17:04:58 -08:00
Documentation powerpc/pseries/papr-sysparm: Expose character device to user space 2023-12-13 21:38:21 +11:00
drivers powerpc: Add PVN support for HeXin C2000 processor 2023-12-01 21:15:33 +11:00
fs Bug fixes for 6.7-rc2: 2023-11-18 11:28:28 -08:00
include Kbuild fixes for v6.7 2023-11-19 13:54:28 -08:00
init As usual, lots of singleton and doubleton patches all over the tree and 2023-11-02 20:53:31 -10:00
io_uring io_uring/fdinfo: remove need for sqpoll lock for thread/pid retrieval 2023-11-15 06:35:46 -07:00
ipc Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
kernel - Do the push of pending hrtimers away from a CPU which is being 2023-11-19 13:35:07 -08:00
lib Zstd fixes for v6.7 2023-11-14 23:35:31 -05:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: more ptep_get() conversion 2023-11-15 15:30:09 -08:00
net netfilter pull request 23-11-15 2023-11-16 11:02:52 +01:00
rust Kbuild updates for v6.7 2023-11-04 08:07:19 -10:00
samples Landlock updates for v6.7-rc1 2023-11-03 09:28:53 -10:00
scripts Kbuild fixes for v6.7 2023-11-19 13:54:28 -08:00
security + Features 2023-11-03 09:48:17 -10:00
sound sound fixes for 6.7-rc2 2023-11-17 09:05:31 -05:00
tools powerpc/selftests: Add test for papr-sysparm 2023-12-13 21:38:21 +11:00
usr arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
virt ARM: 2023-09-07 13:52:20 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: generate kernel.spec in rpmbuild/SPECS/ 2023-10-03 20:49:09 +09:00
.mailmap As usual, lots of singleton and doubleton patches all over the tree and 2023-11-02 20:53:31 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: powerpc: Transfer PPC83XX to Christophe 2023-12-07 23:34:20 +11:00
Makefile Linux 6.7-rc2 2023-11-19 15:02:14 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.