From 1b16bf42d154c8fbbab2cccc419e2ba47d700849 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Fri, 15 Jul 2016 03:46:30 -0400 Subject: [PATCH] macvtap: avoid hash calculating for single queue We decide the rxq through calculating its hash which is not necessary if we only have one rx queue. So this patch skip this and just return queue 0. Test shows 22% improving on guest rx pps. Before: 1201504 pkts/s After: 1472731 pkts/s Signed-off-by: Jason Wang Signed-off-by: David S. Miller --- drivers/net/macvtap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index 95a13321f688..2476923b424d 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -299,6 +299,9 @@ static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, if (!numvtaps) goto out; + if (numvtaps == 1) + goto single; + /* Check if we can use flow to select a queue */ rxq = skb_get_hash(skb); if (rxq) { @@ -316,6 +319,7 @@ static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, goto out; } +single: tap = rcu_dereference(vlan->taps[0]); out: return tap; -- 2.20.1