netdev - Re: [PATCH] tcp: fixes for DSACK-based undo of cwnd reduction during fast recovery

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Date:	Mon, 14 Nov 2011 01:45:53 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ycheng@...gle.com
Cc:	ncardwell@...gle.com, netdev@...r.kernel.org,
	ilpo.jarvinen@...sinki.fi, nanditad@...gle.com, therbert@...gle.com
Subject: Re: [PATCH] tcp: fixes for DSACK-based undo of cwnd reduction
 during fast recovery

From: Yuchung Cheng <ycheng@...gle.com>
Date: Tue, 8 Nov 2011 17:18:34 -0800

> On Tue, Nov 8, 2011 at 10:07 AM, Neal Cardwell <ncardwell@...gle.com> wrote:
>> Fixes for some issues that prevent DSACKs from allowing TCP senders to
>> undo cwnd reductions made during fast recovery.
 ...
>> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> Acked-by: Yuchung Cheng <ycheng@...gle.com>
> 
> 
> FWIW. This undo-fix patch on Google Web servers increased the undos in
> loss by 46% and in disorder by 17%. It also corrects the SNMP stats
> TCPTimeouts, TCPRenoFailures, TCPSackFailures by moving state into
> open, instead of disorder, after recovery.

Just wanted to give you guys a heads-up that this patch will take me
some time to review properly.
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