Frederic Leroy schrieb:

Le Wed, 2 Dec 2009 18:05:24 +0200 (EET),
"Ilpo Järvinen" [off-list ref] a écrit :

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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

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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 ... :)