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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>