netdev - [PATCH 3/3] NIU: Implement discard counters, optimize

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Date:	Thu, 18 Dec 2008 14:58:26 +0100
From:	Jesper Dangaard Brouer <hawk@...x.dk>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Robert Olsson <Robert.Olsson@...a.slu.se>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, hawk@...x.dk
Subject: [PATCH 3/3] NIU: Implement discard counters, optimize


Optimize the lightly loaded case, by only syncronizing discards stats
when qlen > 10 indicate potential for drops.

Notice Robert Olsson might disagree with this patch.

Signed-off-by: Jesper Dangaard Brouer <hawk@...x.dk>
---

 drivers/net/niu.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/net/niu.c b/drivers/net/niu.c
index 9f6a98f..7746230 100644
--- a/drivers/net/niu.c
+++ b/drivers/net/niu.c
@@ -3620,7 +3620,9 @@ 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;
 }


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