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

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Message-Id: <E1KLvds-0001Mc-00@gondolin.me.apana.org.au>
Date:	Thu, 24 Jul 2008 15:53:40 +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
Subject: Re: [TCP bug, regression] stuck distcc connections in latest -git

Ingo Molnar <mingo@...e.hu> wrote:
> 
> here's a longer log from the server, with sequences, flags, etc:

Sorry but which is the server, phoenix?

> 08:28:48.029057 IP (tos 0x0, ttl 64, id 27412, offset 0, flags [DF], proto TCP (6), length 40) phoenix.distcc > dione.39201: ., cksum 0x8316 (correct), 2272574194:2272574194(0) ack 234561256 win 65535
> 08:30:48.049167 IP (tos 0x0, ttl 64, id 14022, offset 0, flags [DF], proto TCP (6), length 576) dione.39201 > phoenix.distcc: . 234561256:234561792(536) ack 2272574194 win 5840
> 08:30:48.049223 IP (tos 0x0, ttl 64, id 27413, offset 0, flags [DF], proto TCP (6), length 40) phoenix.distcc > dione.39201: ., cksum 0x80fe (correct), 2272574194:2272574194(0) ack 234561792 win 65535
> 08:30:48.049341 IP (tos 0x0, ttl 64, id 14023, offset 0, flags [DF], proto TCP (6), length 576) dione.39201 > phoenix.distcc: . 234626648:234627184(536) ack 2272574194 win 5840
> 08:30:48.049348 IP (tos 0x0, ttl 64, id 14024, offset 0, flags [DF], proto TCP (6), length 183) dione.39201 > phoenix.distcc: . 234627184:234627327(143) ack 2272574194 win 5840
> 08:30:48.049354 IP (tos 0x0, ttl 64, id 27414, offset 0, flags [DF], proto TCP (6), length 40) phoenix.distcc > dione.39201: ., cksum 0x80fe (correct), 2272574194:2272574194(0) ack 234561792 win 65535
> 08:30:48.049359 IP (tos 0x0, ttl 64, id 27415, offset 0, flags [DF], proto TCP (6), length 40) phoenix.distcc > dione.39201: ., cksum 0x80fe (correct), 2272574194:2272574194(0) ack 234561792 win 65535

No further traffic is generated for this connection?

For a problem like this, you really need to dump on both sides
to get the full picture.  Otherwise it's difficult to tell why
we have a gap after 234561792 which is never filled in by dione.

BTW any reason why you appear to have SACK off?

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