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

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Message-Id: <20130324.172821.1575298454791235977.davem@davemloft.net>
Date:	Sun, 24 Mar 2013 17:28:21 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ncardwell@...gle.com
Cc:	ycheng@...gle.com, edumazet@...gle.com, nanditad@...gle.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] tcp: undo spurious timeout after SACK reneging

From: Neal Cardwell <ncardwell@...gle.com>
Date: Sun, 24 Mar 2013 16:50:41 -0400

> 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>

Applied.
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