From fbf8866d65d5de84f75563eb0edd7fc27dbe9a90 Mon Sep 17 00:00:00 2001 From: Shawn Bohrer Date: Mon, 7 Oct 2013 11:01:40 -0500 Subject: net: ipv4 only populate IP_PKTINFO when needed The since the removal of the routing cache computing fib_compute_spec_dst() does a fib_table lookup for each UDP multicast packet received. This has introduced a performance regression for some UDP workloads. This change skips populating the packet info for sockets that do not have IP_PKTINFO set. Benchmark results from a netperf UDP_RR test: Before 89789.68 transactions/s After 90587.62 transactions/s Benchmark results from a fio 1 byte UDP multicast pingpong test (Multicast one way unicast response): Before 12.63us RTT After 12.48us RTT Signed-off-by: Shawn Bohrer Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- include/net/ip.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/net/ip.h') diff --git a/include/net/ip.h b/include/net/ip.h index 16078f42239..b39ebe5339a 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -459,7 +459,7 @@ int ip_options_rcv_srr(struct sk_buff *skb); * Functions provided by ip_sockglue.c */ -void ipv4_pktinfo_prepare(struct sk_buff *skb); +void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc); int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, -- cgit v1.2.3-70-g09d2