Merge branch 'tcp_dccp_ports'

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Eric Dumazet says:

====================
tcp/dccp: better use of ephemeral ports

Big servers have bloated bind table, making very hard to succeed
ephemeral port allocations, without special containers/namespace tricks.

This patch series extends the strategy added in commit 07f4c90062
("tcp/dccp: try to not exhaust ip_local_port_range in connect()").

Since ports used by connect() are much likely to be shared among them,
we give a hint to both bind() and connect() to keep the crowds separated
if possible.

Of course, if on a specific host an application needs to allocate ~30000
ports using bind(), it will still be able to do so. Same for ~30000 connect()
to a unique 2-tuple (dst addr, dst port)

New implemetation is also more friendly to softirqs and reschedules.

v2: rebase after TCP SO_REUSEPORT changes
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

David S. Miller 2016-02-12 05:28:38 -05:00

parent 3134b9f019 ea8add2b19

commit e51271d4ce

2 changed files with 199 additions and 211 deletions

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244

net/ipv4/inet_connection_sock.c

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182

net/ipv4/inet_hashtables.c

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