netdev - Re: [PATCH] tcp: frto should not set snd

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Message-ID: <20130206211343.GW8912@reaktio.net>
Date:	Wed, 6 Feb 2013 23:13:43 +0200
From:	Pasi Kärkkäinen <pasik@....fi>
To:	David Miller <davem@...emloft.net>
Cc:	ncardwell@...gle.com, ilpo.jarvinen@...sinki.fi,
	eric.dumazet@...il.com, hannes@...essinduktion.org,
	stephen@...workplumber.org, netdev@...r.kernel.org,
	ycheng@...gle.com
Subject: Re: [PATCH] tcp: frto should not set snd_cwnd to 0

On Wed, Feb 06, 2013 at 03:55:04PM -0500, David Miller wrote:
> From: Neal Cardwell <ncardwell@...gle.com>
> Date: Tue, 5 Feb 2013 14:49:04 -0500
> 
> > On Mon, Feb 4, 2013 at 7:14 AM, Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> wrote:
> >> [PATCH 1/1] tcp: fix for zero packets_in_flight was too broad
> >>
> >> There are transients during normal FRTO procedure during which
> >> the packets_in_flight can go to zero between write_queue state
> >> updates and firing the resulting segments out. As FRTO processing
> >> occurs during that window the check must be more precise to
> >> not match "spuriously" :-). More specificly, e.g., when
> >> packets_in_flight is zero but FLAG_DATA_ACKED is true the problematic
> >> branch that set cwnd into zero would not be taken and new segments
> >> might be sent out later.
> >>
> >> Only compile tested.
> >>
> >> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
>  ...
> > Acked-by: Neal Cardwell <ncardwell@...gle.com>
> 
> Applied, thanks everyone.
>

Hmm.. are we missing CC stable@...nel.org in these patches? 
I guess 3.6.x is already EOL, but it'd be nice to get this bug fixed also in 3.7.x ..

Thanks,

-- Pasi

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