linux-kernel - Re: [PATCH] tcp: bind() use stronger condition for bind

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Message-ID: <CAHG7+CDeve6WoQB4+q4LwaJVy_gLHbfsDpAt+8rqhw0VUeBA8w@mail.gmail.com>
Date:	Thu, 29 Mar 2012 11:22:21 +0300
From:	Alexandru Copot <alex.mihai.c@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Daniel Baluta <dbaluta@...acom.com>,
	Flavio Leitner <fbl@...hat.com>, davem@...emloft.net,
	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tcp: bind() use stronger condition for bind_conflict

On Wed, Mar 28, 2012 at 11:12 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:

> Some performance data would be welcomed, in the case many sockets are
> already bound...

I've done some tests running a program that creates and binds(0) 90000 sockets.
The total running time, on average, is:
*  without this patch: 0.352 s
*  with the patch:       0.355 s

Also, recording this program with perf shows a small increase of 0.6%
for inet_csk_get_port
relative to inet_bind, after applying the patch.

So the performance is almost the same, even for such a large number of sockets.

Alex Copot
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