Commit 1b16bf42 authored Jul 15, 2016 by Jason Wang Committed by David S. Miller Jul 15, 2016

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 <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent e980a076

drivers/net/macvtap.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;

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