NIU: Implement discard counters, optimize
Optimize the lightly loaded case, by only synchronizing discards stats when qlen > 10 indicate potential for drops. Notice Robert Olsson might disagree with this patch. Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
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