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Message-ID: <Pine.LNX.4.64.0805311431100.2329@wrl-59.cs.helsinki.fi>
Date: Sat, 31 May 2008 14:46:21 +0300 (EEST)
From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To: Ingo Molnar <mingo@...e.hu>
cc: LKML <linux-kernel@...r.kernel.org>,
Netdev <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
"Rafael J. Wysocki" <rjw@...k.pl>,
Andrew Morton <akpm@...ux-foundation.org>,
Evgeniy Polyakov <johnpol@....mipt.ru>
Subject: Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+
On Sat, 31 May 2008, Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
>
> > ah, in retrospect i realized that this test had one flaw: some of the
> > systems i the build cluster already ran a newer kernel and hence were
> > targets for this bug.
> >
> > so i turned off CONFIG_TCP_CONG_CUBIC on all the testboxes and
> > rebooted the cluster boxes into 2.6.25, and the hung sockets are now
> > gone. (about 150 successful iterations)
> >
> > i did another change as well: i removed the localhost distcc
> > component. I'll reinstate that now to make sure it's really related to
> > TCP_CONG_CUBIC and not to localhost networking.
>
> ok, once i added back the localhost distcc component and the hung kernel
> build + stuck TCP socket bug happened again overnight:
>
> Active Internet connections (w/o servers)
> Proto Recv-Q Send-Q Local Address Foreign Address State
> tcp 72187 0 10.0.1.14:3632 10.0.1.14:47910 ESTABLISHED
> tcp 0 174464 10.0.1.14:47910 10.0.1.14:3632 ESTABLISHED
>
> so it seems distcc over localhost was the aspect that made it fail.
>
> _Perhaps_ what matters is to have the new post-rc3 TCP code on _both_
> sides of the connection. But that is just a theory - it could be timing,
> etc.
Btw, does your distcc perhaps happen enable TCP_DEFER_ACCEPT (there were
some post 2.6.25 changes into it)?
--
i.
--
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