From: Yuchung Cheng <ycheng@google.com>
Date: Sun, 24 Mar 2013 10:42:25 +0000 (+0000)
Subject: tcp: undo spurious timeout after SACK reneging
X-Git-Tag: v3.9-rc5~28^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ebe183c6d444ef5587d803b64a1f4734b18c564;p=pandora-kernel.git

tcp: undo spurious timeout after SACK reneging

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@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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