netdev - Re: scp stalls mysteriously

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Message-id: <4B16BD58.3040802@tvk.rwth-aachen.de>
Date:	Wed, 02 Dec 2009 20:17:44 +0100
From:	Damian Lukowski <damian@....rwth-aachen.de>
To:	Frederic Leroy <fredo@...rox.org>
Cc:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Netdev <netdev@...r.kernel.org>, Asdo <asdo@...ftmail.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: scp stalls mysteriously

Frederic Leroy schrieb:
> Le Wed, 2 Dec 2009 18:05:24 +0200 (EET),
> "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> a écrit :
> 
>>>> In one of the cases, also the sg end dies (the 4th case). I
>>>> suppose that was running earlier kernel already?
>>> This case was the one with tcp_frto=2 and tcp_timestamps=0 on houba.
>> I suppose we're confused, I was refering to .4. case, did you perhaps
>> mix that up with the latest set of tests which yields .8.?
> 
> You're right, I was talking about .8
> 
>> In the recent work, the most suspicious things are the new timeout
>> things, I'll read them through once I've some time (but so far I've
>> not found anything wrong in them but I of course can miss something
>> subtle). ...I've added Damian as CC if he has some idea. If you want
>> you can try with a trivial revert of that stuff, I've included a
>> patch for that below.
> 
> I will try it. 

Hi,
could you please printk retrans_stamp just before the return in 
include/net/tcp.h:retransmits_timed_out()?
If the value is not monotonically increasing but is reset to 0 at some
point, this might lead to problems in tcp_write_timeout().
It's the only idea I have now.

> 
> I just discover something not good. I use tuxonice[1] branch on houba
> for 2.6.32*.
> Although my 2.6.31 kernel is vanilla[2].
> 
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/nigelc/tuxonice-head.git
> [2] git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> 
> Now, I'm gonna go compile kernels again and again and make more
> tests ... :)
> 

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