netdev - Re: Network hangs with 2.6.30.5

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Date:	Fri, 02 Oct 2009 14:38:30 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
CC:	David Miller <davem@...emloft.net>, jarkao2@...il.com,
	holger.hoffstaette@...glemail.com, Netdev <netdev@...r.kernel.org>,
	Evgeniy Polyakov <zbr@...emap.net>
Subject: Re: Network hangs with 2.6.30.5

Ilpo Järvinen a écrit :
> On Fri, 2 Oct 2009, Ilpo Järvinen wrote:
> 
>> On Thu, 1 Oct 2009, David Miller wrote:
>>
>>> 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?
>> Argh, not that one ...the jungle of negations. But I'll try to go it 
>> through once more but I tell you I did go through those negations multiple 
>> times already before submitting it :-).
>>
>>> 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.
>> What about the more than 64k connections change a9d8f9110d7e953c2f2 (or 
>> its fixes), it might be another possibility? ...It certainly does 
>> something related to reuse and happens to be in the correct time frame... 
>> (I've added Evgeniy).

I scratched my head to reproduce the conditions of hang but failed.

I am pretty sure both commits are OK (yours and mine), maybe a brute force
git bisection is needed.

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