netdev - Re: [PATCH net-2.6.24 0/3]: More TCP fixes

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Date:	Thu, 04 Oct 2007 16:53:41 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
CC:	David Miller <davem@...emloft.net>, Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-2.6.24 0/3]: More TCP fixes

Ilpo Järvinen wrote:
> On Wed, 3 Oct 2007, Cedric Le Goater wrote:
> 
>> Cedric Le Goater wrote:
>>> Below are the messages I got on 2) right after running ketchup (which does 
>>> a wget www.kernel.org) 
> 
> Oops, those tcp_fragment WARNINGs in the other mail were due to bug in 
> the debug patch as it called verify too early in there (before queue was 
> adjusted, no wonder it finds state inconsistent at that point, fixed that)...
> 
> ...So please discard all old debug patches, they're all broken in this 
> respect... :-(
> 
>>> not a warning on 1) with your extra verbose patch.
>> bummer, I got this one on 1) :(
>>
>> WARNING: at /home/legoater/linux/net-2.6.24.git/net/ipv4/tcp_input.c:2325 tcp_fastretrans_alert()
>> Call Trace:
>>  <IRQ>  [<ffffffff8022ddb6>] __wake_up+0x1f/0x4c
>>  [<ffffffff803fd9d3>] tcp_ack+0xcee/0x18ac
>>  [<ffffffff80400764>] tcp_rcv_established+0x61f/0x6df
> 
> ...I just wonder why that's the first place where it occurs... Can you try 
> the debug patch below (fixed verify place in tcp_fragment/collapse, added 
> some of them to narrow it down, and handled GSO more user friendly way in 
> the printout). Put it on top of those three patches (mm should be fine :-)).
> ...I wish the verify triggers way before the fastretrans trap (for some 
> reason it didn't do that in the quoted trace, maybe I had some verifys 
> missing in that old patch or something)...

so here are the results on a net-2.6.24 kernel. 

I've put the patchset here to make sure it's correct: 

	http://legoater.free.fr/patches/2.6.23/net-2.6.24.git-tcp_fastretrans/

and plenty of logs :

	http://legoater.free.fr/patches/2.6.23/net-2.6.24.git-tcp_fastretrans.messages

FYI, config is here :

	http://legoater.free.fr/patches/2.6.23/net-2.6.24.git-tcp_fastretrans.config

C.
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