netdev - Re: [PATCH] tcp: undo spurious timeout after SACK reneging

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Message-ID: <CADVnQy=koYif1cM+VuXirz26jV33zDK2KHNW=EQUfRaGqBHa+g@mail.gmail.com>
Date:	Sun, 24 Mar 2013 16:50:41 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] tcp: undo spurious timeout after SACK reneging

On Sun, Mar 24, 2013 at 4:42 PM, Yuchung Cheng <ycheng@...gle.com> wrote:
> On SACK reneging the sender immediately retransmits and forces a
> timeout but disables Eifel (undo). If the (buggy) receiver does not
> drop any packet this can trigger a false slow-start retransmit storm
> driven by the ACKs of the original packets. This can be detected with
> undo and TCP timestamps.
>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> ---
>  net/ipv4/tcp_input.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)

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

neal
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