macvtap: switch to use skb array
This patch switch to use skb array instead of sk_receive_queue to avoid spinlock contentions. Tests shows about 21% improvements for guest rx pps: Before: 1472731 pkts/s After: 1786289 pkts/s Signed-off-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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