netdev - Re: [PATCH net-2.6 1/2] [TCP]: Fix ratehalving with bidirectional flows

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Date:	Mon, 30 Jul 2007 19:49:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6 1/2] [TCP]: Fix ratehalving with bidirectional
 flows

From: "Ilpo_Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Mon, 30 Jul 2007 20:18:45 +0300 (EEST)

> Actually, the ratehalving seems to work too well, as cwnd is
> reduced on every second ACK even though the packets in flight
> remains unchanged. Recoveries in a bidirectional flows suffer
> quite badly because of this, both NewReno and SACK are affected.
> 
> After this patch, rate halving is performed for ACK only if
> packets in flight was supposedly changed too.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>

This fix looks great, and I see no potential problems with
Reno after doing a bit of auditing.

Applied and I'll push to -stable too.
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