netdev - Re: [PATCH net] tcp: fix double-counted receiver RTT when leaving receiver fast path

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Message-Id: <20130304.141608.981016306872498634.davem@davemloft.net>
Date:	Mon, 04 Mar 2013 14:16:08 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ncardwell@...gle.com, edumazet@...gle.com, ycheng@...gle.com,
	nanditad@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] tcp: fix double-counted receiver RTT when leaving
 receiver fast path

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 04 Mar 2013 08:55:33 -0800

> On Mon, 2013-03-04 at 11:23 -0500, Neal Cardwell wrote:
>> We should not update ts_recent and call tcp_rcv_rtt_measure_ts() both
>> before and after going to step5. That wastes CPU and double-counts the
>> receiver-side RTT sample.
>> 
>> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
 ...
> Acked-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable.
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