netdev - Re: [PATCH 2/5] tcp: use DSACKs that arrive when packets

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Message-Id: <20111127.185550.78935068183903191.davem@davemloft.net>
Date:	Sun, 27 Nov 2011 18:55:50 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	ncardwell@...gle.com, netdev@...r.kernel.org, nanditad@...gle.com,
	ycheng@...gle.com, therbert@...gle.com
Subject: Re: [PATCH 2/5] tcp: use DSACKs that arrive when packets_out is 0

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Thu, 17 Nov 2011 03:34:17 +0200 (EET)

> On Wed, 16 Nov 2011, Neal Cardwell wrote:
> 
>> The bug: Senders ignored DSACKs after recovery when there were no
>> outstanding packets (a common scenario for HTTP servers).
>> 
>> The change: when there are no outstanding packets (the "no_queue" goto
>> label), call tcp_fastretrans_alert() in order to use DSACKs to undo
>> congestion window reductions.
>> 
>> Other patches in this series will provide other changes that are
>> necessary to fully fix this problem.
>> 
>> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
 ...
> 
> Acked-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>

Applied to net-next.
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