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authorPaolo Abeni <pabeni@redhat.com>2017-06-22 16:01:22 +0300
committerDavid S. Miller <davem@davemloft.net>2017-06-22 20:44:04 +0300
commit4b943faedfc29eda882851b772c06cecdf78d8e3 (patch)
tree973e773b5bbbb92bc4832fd13d2de46f61b4ebe3 /net
parentea9fc3c5b299a95dacb0a85745c078ce7aa678ca (diff)
downloadlinux-4b943faedfc29eda882851b772c06cecdf78d8e3.tar.xz
udp/v6: prefetch rmem_alloc in udp6_queue_rcv_skb()
very similar to commit dd99e425be23 ("udp: prefetch rmem_alloc in udp_queue_rcv_skb()"), this allows saving a cache miss when the BH is bottle-neck for UDP over ipv6 packet processing, e.g. for small packets when a single RX NIC ingress queue is in use. Performances under flood when multiple NIC RX queues used are unaffected, but when a single NIC rx queue is in use, this gives ~8% performance improvement. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/udp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 2b33847bf931..d1d728805729 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -630,6 +630,7 @@ static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
}
}
+ prefetch(&sk->sk_rmem_alloc);
if (rcu_access_pointer(sk->sk_filter) &&
udp_lib_checksum_complete(skb))
goto csum_error;