From: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Date: Sun, 21 Sep 2008 04:25:52 +0000 (-0700)
Subject: tcp: don't clear lost_skb_hint when not necessary
X-Git-Tag: v2.6.28-rc1~717^2~254
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=90638a04ad8484b6b6c567656fb3f6d0689e23da;p=pandora-kernel.git

tcp: don't clear lost_skb_hint when not necessary

Most importantly avoid doing it with cumulative ACK. However,
since we have lost_cnt_hint in the picture as well needing
adjustments, it's not as trivial as dealing with
retransmit_skb_hint (and cannot be done in the all place we
could trivially leave retransmit_skb_hint untouched).

With the previous patch, this should mostly remove O(n^2)
behavior while cumulative ACKs start flowing once rexmit
after a lossy round-trip made it through.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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