From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Fri, 20 Apr 2012 08:51:45 +0000 (+0000)
Subject: e1000e: Fix default interrupt throttle rate not set in NIC HW
X-Git-Tag: v3.4-rc6~23^2~35^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=727c356f4d799b53f94cf8fe43e19d64482348c7;p=pandora-kernel.git

e1000e: Fix default interrupt throttle rate not set in NIC HW

Based on the original patch from  Ying Cai <ycai@google.com>
This change ensures that the itr/itr_setting adjustment logic is used,
even for the default/compiled-in value.

Context:
  When we changed the default InterruptThrottleRate value from default
  (3 = dynamic mode) to 8000 for example, only adapter->itr_setting
  (which controls interrupt coalescing mode) was set to 8000, but
  adapter->itr (which controls the value set in NIC register) was not
  updated accordingly. So from ethtool, it seemed the interrupt
  throttling is enabled at 8000 intr/s, but the NIC actually was
  running in dynamic mode which has lower CPU efficiency especially
  when throughput is not high.

CC: Ying Cai <ycai@google.com>
CC: David Decotigny <david.decotigny@google.com>
Signed-off-by: Jeff Kirsher <jeffrey.kirsher@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
---

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