From: Hariprasad Shenai <hariprasad@chelsio.com>
Date: Wed, 4 Feb 2015 10:02:52 +0000 (+0530)
Subject: cxgb4: Add low latency socket busy_poll support
X-Git-Tag: fixes-v4.0-rc1~150^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a336cb17183b29827fdffaffb5e62f8912f5ca1;p=pandora-kernel.git

cxgb4: Add low latency socket busy_poll support

cxgb_busy_poll, corresponding to ndo_busy_poll, gets called by the socket
waiting for data.

With busy_poll enabled, improvement is seen in latency numbers as observed by
collecting netperf TCP_RR numbers.
Below are latency number, with and without busy-poll, in a switched environment
for a particular msg size:
netperf command: netperf -4 -H <ip> -l 30 -t TCP_RR -- -r1,1
Latency without busy-poll: ~16.25 us
Latency with busy-poll   : ~08.79 us

Based on original work by Kumar Sanghvi <kumaras@chelsio.com>

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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