netdev - Re: [TCP bug, regression] stuck distcc connections in latest -git

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Message-ID: <Pine.LNX.4.64.0807241233130.24801@wrl-59.cs.helsinki.fi>
Date:	Thu, 24 Jul 2008 12:36:44 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Herbert Xu <herbert@...dor.apana.org.au>
cc:	Ingo Molnar <mingo@...e.hu>, w@....eu, davem@...emloft.net,
	davidn@...idnewall.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stefanr@...6.in-berlin.de,
	rjw@...k.pl, ilpo.jarvinen@...sinki.fi
Subject: Re: [TCP bug, regression] stuck distcc connections in latest -git

On Thu, 24 Jul 2008, Herbert Xu wrote:

> Ingo Molnar <mingo@...e.hu> wrote:
> >
> > the client (running 2.6.24) does periodic 120 seconds retransmits:
> > 
> > 07:40:48.255452 IP dione.39201 > phoenix.distcc: . 1608:2144(536) ack 1 win 584007:40:48.255547 IP phoenix.distcc > dione.39201: . ack 2144 win 65535
> > 07:40:48.255564 IP dione.39201 > phoenix.distcc: . 67143:67679(536) ack 1 win 5840
> > 07:40:48.255648 IP phoenix.distcc > dione.39201: . ack 2144 win 65535
> > 07:42:48.255440 IP dione.39201 > phoenix.distcc: . 2144:2680(536) ack 1 win 5840
> > 07:42:48.255559 IP phoenix.distcc > dione.39201: . ack 2680 win 65535
> > 07:42:48.255570 IP dione.39201 > phoenix.distcc: . 67679:68215(536) ack 1 win 5840
> > 07:42:48.255659 IP phoenix.distcc > dione.39201: . ack 2680 win 65535
> > 07:44:48.255436 IP dione.39201 > phoenix.distcc: . 2680:3216(536) ack 1 win 584007:44:48.255570 IP phoenix.distcc > dione.39201: . ack 3216 win 65535
> > 07:44:48.255585 IP dione.39201 > phoenix.distcc: . 68215:68751(536) ack 1 win 5840
> > 07:44:48.255669 IP phoenix.distcc > dione.39201: . ack 3216 win 65535
>
> OK, something's seriously screwed up on dione's kernel.  Could
> you please disable syncookies (which should enable SACK for you)
> and see if the problem goes away?

This looks like the FRTO bugs we fixed in 2.6.25.7, afaik, 2.6.24.y wasn't 
anymore updated at that time so it's a bit obsolete...


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