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(parent: da2e9cf) | patch
udp: prefetch rmem_alloc in udp_queue_rcv_skb()
authorPaolo Abeni <pabeni@redhat.com>
Wed, 21 Jun 2017 08:24:40 +0000 (10:24 +0200)
committerDavid S. Miller <davem@davemloft.net>
Wed, 21 Jun 2017 15:38:11 +0000 (11:38 -0400)
commitdd99e425be23294a9a91b365bd04f9b255fb72e8
tree0bd383473708ab4a183c3a138b6cee363ae4d569tree | snapshot (tar.gz zip)
parentda2e9cf03b8fccbb69dd1e215bb1e554ce8e8cbecommit | diff
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>
net/ipv4/udp.c diff | blob | blame | history