From: Eric Dumazet <edumazet@google.com>
Date: Tue, 28 Oct 2014 04:45:24 +0000 (-0700)
Subject: tcp: allow for bigger reordering level
X-Git-Tag: omap-for-v3.19/fixes-rc1~125^2~325
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dca145ffaa8d39ea1904491ac81b92b7049372c0;p=pandora-kernel.git

tcp: allow for bigger reordering level

While testing upcoming Yaogong patch (converting out of order queue
into an RB tree), I hit the max reordering level of linux TCP stack.

Reordering level was limited to 127 for no good reason, and some
network setups [1] can easily reach this limit and get limited
throughput.

Allow a new max limit of 300, and add a sysctl to allow admins to even
allow bigger (or lower) values if needed.

[1] Aggregation of links, per packet load balancing, fabrics not doing
 deep packet inspections, alternative TCP congestion modules...

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Yaogong Wang <wygivan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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