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authorJesper Dangaard Brouer <hawk@comx.dk>2008-12-18 19:51:56 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-18 22:27:41 -0800
commite98def1f71fa0a6a37e12a56eb52ce5ed9e2e800 (patch)
tree575063ef3b8ab38c762fcb86cce75ac0abc84c3f
parentd231776fda4a1ed754298720c5fbc29eb34f130c (diff)
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>
-rw-r--r--drivers/net/niu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/niu.c b/drivers/net/niu.c
index 671721c8ca6..f219f16ec97 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;
}