udp: prefetch rmem_alloc in udp_queue_rcv_skb()
On UDP packets processing, if the BH is the bottle-neck, it always sees a cache miss while updating rmem_alloc; try to avoid it prefetching the value as soon as we have the socket available. Performances under flood with multiple NIC rx queues used are unaffected, but when a single NIC rx queue is in use, this gives ~10% performance improvement. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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