Stephen Hemminger 7e9e49feea igb: workaround errata with wthresh on 82576
The 82576 has known issues which require the write threshold to be set to 1.
See:
	http://download.intel.com/design/network/specupdt/82576_SPECUPDATE.pdf

If not then single packets will hang in transmit ring until more arrive.
Simple tests like ping will fail.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Reviewed-by: Vincent Jardin <vincent.jardin@6wind.com>
2013-09-17 14:09:23 +02:00
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