netdev - Re: 2.6.27.8 (+the idr fix) TCP Ack issue

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Message-Id: <20090102.133435.105577950.davem@davemloft.net>
Date:	Fri, 02 Jan 2009 13:34:35 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rmk@....linux.org.uk
Cc:	ilpo.jarvinen@...sinki.fi, netdev@...r.kernel.org,
	bhutchings@...arflare.com
Subject: Re: 2.6.27.8 (+the idr fix) TCP Ack issue

From: Russell King <rmk@....linux.org.uk>
Date: Fri, 2 Jan 2009 14:26:09 +0000

> Remote end sequence number is still at 1190.
> 
> 19:47:32.285397 IP (tos 0x0, ttl  64, id 30055, offset 0, flags [DF], proto: TCP (6), length: 40) dyn-67.arm.linux.org.uk.38803 > 193.108.74.209.http: ., cksum 0x41e5 (correct), 3216:3216(0) ack 2215 win 10701
> 19:47:32.320287 IP (tos 0x0, ttl 238, id 10, offset 0, flags [none], proto: TCP (6), length: 40) 193.108.74.209.http > dyn-67.arm.linux.org.uk.38803: ., cksum 0x45e6 (correct), 1190:1190(0) ack 3216 win 10701
> 19:47:32.320300 IP (tos 0x0, ttl  64, id 30056, offset 0, flags [DF], proto: TCP (6), length: 40) dyn-67.arm.linux.org.uk.38803 > 193.108.74.209.http: ., cksum 0x41e5 (correct), 3216:3216(0) ack 2215 win 10701
> 19:47:32.353016 IP (tos 0x0, ttl 238, id 12, offset 0, flags [none], proto: TCP (6), length: 40) 193.108.74.209.http > dyn-67.arm.linux.org.uk.38803: ., cksum 0x45e6 (correct), 1190:1190(0) ack 3216 win 10701
> ...
> 
> So it looks to me like the remote end doesn't like our ack of 2215 for
> some reason.

Let's make sure the checksum is OK.  That's a reason the ACK might
get dropped at the remote end.

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