linux-kernel - Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+

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Message-ID: <Pine.LNX.4.64.0805311555570.2329@wrl-59.cs.helsinki.fi>
Date:	Sat, 31 May 2008 15:58:56 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Peter Zijlstra <peterz@...radead.org>,
	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:

> 
> * Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> wrote:
> 
> > > Btw, does your distcc perhaps happen enable TCP_DEFER_ACCEPT (there 
> > > were some post 2.6.25 changes into it)?
> > 
> > Hmm, if so, please try this revert below (I hope I got everything that 
> > is related there, gitk is currently broken for me so that viewing many 
> > commits quickly is a pain, so I might have accidently missed 
> > something)...
> 
> what is the easiest way to figure out whether my version of distcc 
> enables TCP_DEFER_ACCEPT?

strace distccd (the listening party is the interesting one here, not the 
distcc)?

...setsockopt(listenfd, SOL_TCP, TCP_DEFER_ACCEPT, &val, sizeof(val)) 
seems to be the magic trick that is interestion here.

-- 
 i.