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authorEric Dumazet <edumazet@google.com>2016-11-18 17:18:03 -0800
committerDavid S. Miller <davem@davemloft.net>2016-11-21 11:26:59 -0500
commitd21dbdfe0afb5195607d207f894fe86d5b322d46 (patch)
tree2c0e30146d70859144e25cdf665b09750fa6eb99 /net/ipv4/udp.c
parentee9d5461c0e88c51f08d0ef7149ce8469a4b4340 (diff)
downloadop-kernel-dev-d21dbdfe0afb5195607d207f894fe86d5b322d46.zip
op-kernel-dev-d21dbdfe0afb5195607d207f894fe86d5b322d46.tar.gz
udp: avoid one cache line miss in recvmsg()
UDP_SKB_CB(skb)->partial_cov is located at offset 66 in skb, requesting a cold cache line being read in cpu cache. We can avoid this cache line miss for UDP sockets, as partial_cov has a meaning only for UDPLite. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index e1fc011..b949770 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1389,7 +1389,8 @@ try_again:
* coverage checksum (UDP-Lite), do it before the copy.
*/
- if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
+ if (copied < ulen || peeking ||
+ (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
checksum_valid = !udp_lib_checksum_complete(skb);
if (!checksum_valid)
goto csum_copy_err;
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