From: Neal Cardwell <ncardwell@google.com>
Date: Wed, 16 Nov 2011 08:58:02 +0000 (+0000)
Subject: tcp: use DSACKs that arrive when packets_out is 0
X-Git-Tag: v3.3-rc1~182^2~466
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5628adf1a0ff39b9e76e1a8e1c94dadabfd46914;p=pandora-kernel.git

tcp: use DSACKs that arrive when packets_out is 0

The bug: Senders ignored DSACKs after recovery when there were no
outstanding packets (a common scenario for HTTP servers).

The change: when there are no outstanding packets (the "no_queue" goto
label), call tcp_fastretrans_alert() in order to use DSACKs to undo
congestion window reductions.

Other patches in this series will provide other changes that are
necessary to fully fix this problem.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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