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Date:	Thu, 24 Jul 2008 17:05:19 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	mingo@...e.hu (Ingo Molnar)
Cc:	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

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?

I think our Reno code may have been broken.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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