From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sun, 4 Dec 2011 07:05:17 +0000 (+0000)
Subject: tcp: tcp_sendmsg() page recycling
X-Git-Tag: v3.3-rc1~182^2~359
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=761965eab38d2cbc59c36e355c59609e3a04705a;p=pandora-kernel.git

tcp: tcp_sendmsg() page recycling

If our TCP_PAGE(sk) is not shared (page_count() == 1), we can set page
offset to 0.

This permits better filling of the pages on small to medium tcp writes.

"tbench 16" results on my dev server (2x4x2 machine) :

Before : 3072 MB/s
After  : 3146 MB/s  (2.4 % gain)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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