From: Benjamin LaHaise <ben.lahaise@neterion.com>
Date: Tue, 4 Aug 2009 10:21:39 +0000 (+0000)
Subject: vxge: prefetch RxD descriptors
X-Git-Tag: v2.6.32-rc1~703^2~464
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f23e436d241ac1cf50a659228a5a0e1e6572c1a;p=pandora-kernel.git

vxge: prefetch RxD descriptors

This patch prefetches RxD descriptors which helps to lower the latency of a
cache miss in vxge_hw_ring_rxd_next_completed.  This lowers the % of CPU
time used by vxge_hw_ring_rxd_next_completed() where the descriptor is
accessed in profiling netperf on a P4 Xeon from 1.5% to 1.0%.

Signed-off-by: Benjamin LaHaise <ben.lahaise@neterion.com>
Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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