From: Neal Cardwell <ncardwell@google.com>
Date: Thu, 29 Jan 2015 01:01:36 +0000 (-0500)
Subject: tcp: fix the timid additive increase on stretch ACKs
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~184^2~37^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=814d488c61260521b1b3cc97063700a5a6667c8f;p=pandora-kernel.git

tcp: fix the timid additive increase on stretch ACKs

tcp_cong_avoid_ai() was too timid (snd_cwnd increased too slowly) on
"stretch ACKs" -- cases where the receiver ACKed more than 1 packet in
a single ACK. For example, suppose w is 10 and we get a stretch ACK
for 20 packets, so acked is 20. We ought to increase snd_cwnd by 2
(since acked/w = 20/10 = 2), but instead we were only increasing cwnd
by 1. This patch fixes that behavior.

Reported-by: Eyal Perry <eyalpe@mellanox.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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