From: Jesper Dangaard Brouer Date: Fri, 19 Dec 2008 03:51:56 +0000 (-0800) Subject: NIU: Implement discard counters, optimize X-Git-Tag: firefly_0821_release~16481^2~116 X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=e98def1f71fa0a6a37e12a56eb52ce5ed9e2e800;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: David S. Miller --- diff --git a/drivers/net/niu.c b/drivers/net/niu.c index 671721c8ca65..f219f16ec97a 100644 --- a/drivers/net/niu.c +++ b/drivers/net/niu.c @@ -3618,7 +3618,9 @@ static int niu_rx_work(struct niu *np, struct rx_ring_info *rp, int budget) nw64(RX_DMA_CTL_STAT(rp->rx_channel), stat); - niu_sync_rx_discard_stats(np, rp, 0x7FFF); + /* Only sync discards stats when qlen indicate potential for drops */ + if (qlen > 10) + niu_sync_rx_discard_stats(np, rp, 0x7FFF); return work_done; }