netdev - Re: [PATCH v2] tcp: fix infinite cwnd in tcp_complete

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Message-ID: <CADVnQymFjqqT__kCN-0vqz+jqBLez7aoQZ14KEV5=m=Ed=Nayw@mail.gmail.com>
Date:	Mon, 30 Apr 2012 12:25:56 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	davem@...emloft.net, ilpo.jarvinen@...sinki.fi,
	nanditad@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2] tcp: fix infinite cwnd in tcp_complete_cwr()

On Mon, Apr 30, 2012 at 12:00 PM, Yuchung Cheng <ycheng@...gle.com> wrote:
> When the cwnd reduction is done, ssthresh may be infinite
> if TCP enters CWR via ECN or F-RTO. If cwnd is not undone, i.e.,
> undo_marker is set, tcp_complete_cwr() falsely set cwnd to the
> infinite ssthresh value. The correct operation is to keep cwnd
> intact because it has been updated in ECN or F-RTO.
>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> ---
> ChangeLog since v1:
>  - Add snd_cwnd_stamp timestamping in CWR mode
>
>  net/ipv4/tcp_input.c |    9 ++++++---
>  1 files changed, 6 insertions(+), 3 deletions(-)

Acked-by: Neal Cardwell <ncardwell@...gle.com>

neal
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