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macvtap: avoid hash calculating for single queue

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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 <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2016-07-15 03:46:30 -04:00 committed by David S. Miller
parent e980a0764a
commit 1b16bf42d1
1 changed files with 4 additions and 0 deletions
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4
drivers/net/macvtap.c
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@ -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;