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Date:	Thu, 11 Feb 2016 16:28:48 -0800
From:	Eric Dumazet <>
To:	"David S . Miller" <>
Cc:	netdev <>,
	Eric Dumazet <>,
	Eric Dumazet <>
Subject: [PATCH v2 net-next 0/2] 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 07f4c90062f8 
("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

Eric Dumazet (2):
  tcp/dccp: better use of ephemeral ports in connect()
  tcp/dccp: better use of ephemeral ports in bind()

 net/ipv4/inet_connection_sock.c | 240 +++++++++++++++++++---------------------
 net/ipv4/inet_hashtables.c      | 170 ++++++++++++++--------------
 2 files changed, 199 insertions(+), 211 deletions(-)


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