netdev - Re: TCP ACK loop with 2.6.33-rc6

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Message-ID: <alpine.DEB.2.00.1002271313070.31669@melkinpaasi.cs.helsinki.fi>
Date:	Sat, 27 Feb 2010 13:13:49 +0200 (EET)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Simon Arlott <simon@...e.lp0.eu>
cc:	netdev <netdev@...r.kernel.org>
Subject: Re: TCP ACK loop with 2.6.33-rc6

On Sat, 27 Feb 2010, Simon Arlott wrote:

> Packet capture attached. Is it possible to tell which side is at fault?
> They are both responding to each other's ACK with another ACK at 400pps.
> 
> 10:32:28.991111 IP6 2001:8b0:ffea:0:205:b4ff:fe12:530.35545 > 2001:500:b::1.53: . ack 766 win 58 <nop,nop,timestamp 2411331059 251057709>
> 10:32:28.995046 IP6 2001:500:b::1.53 > 2001:8b0:ffea:0:205:b4ff:fe12:530.35545: . ack 1 win 1559

Why only a single ends talks with timestamps?!?!?

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