From: Jesse Brandeburg <jesse.brandeburg@intel.com>
Date: Thu, 3 Dec 2009 11:33:54 +0000 (+0000)
Subject: ixgbe: use EIAM to automask MSI-X
X-Git-Tag: v2.6.33-rc1~388^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b471446cb376e2d1a4ceb4695059acfc3437f32;p=pandora-kernel.git

ixgbe: use EIAM to automask MSI-X

when disabling interrupts, driver was writing with IO, this is no
necessary because on ixgbe parts the hardware can "oneshot"
disable and clear the interrupt.  So on 82598/82599 use of EIAM
should avoid one posted write per interrupt when in MSI-X mode.
This should improve performance and seems to in my limited
testing, reduce CPU utilization VERY slightly.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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