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

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Message-ID: <20080531163501.GB22607@elte.hu>
Date:	Sat, 31 May 2008 18:35:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
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+


* Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> wrote:

> > 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.

seems to be used:

 22003 write(3, "distccd[22003] (dcc_listen_by_ad"..., 62) = 62
 22003 listen(4, 10)                     = 0
 22003 setsockopt(4, SOL_TCP, TCP_DEFER_ACCEPT, [1], 4) = 0

i'll queue up your reverts for testing in -tip.

	Ingo
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