netdev - Re: Network hangs with 2.6.30.5

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Message-Id: <20091001.154913.88345178.davem@davemloft.net>
Date:	Thu, 01 Oct 2009 15:49:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	holger.hoffstaette@...glemail.com, netdev@...r.kernel.org,
	eric.dumazet@...il.com, ilpo.jarvinen@...sinki.fi
Subject: Re: Network hangs with 2.6.30.5

From: Jarek Poplawski <jarkao2@...il.com>
Date: Mon, 7 Sep 2009 07:21:43 +0000

> While Eric is analyzing your data, I guess you could try reverting
> some stuff around this tcp_tw_recycle, and my tcp ignorance would
> point these commits for the beginning:
> 
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commitdiff;h=fc1ad92dfc4e363a055053746552cdb445ba5c57
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commitdiff;h=c887e6d2d9aee56ee7c9f2af4cec3a5efdcc4c72

Ilpo's cleanup (the second commit listed) looks most likely to
be a possibility.

But I surely cannot find any bugs in it, even after studying it
a few times.

Ilpo could you audit it one more time for us just in case?

I also looked through all the TCP commits in 2.6.29 to 2.6.30
and I could not find anything else that might cause stalls with
time-wait recycled connections.
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