diff options
| author | Shawn Bohrer <sbohrer@rgmadvisors.com> | 2013-10-07 18:01:40 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-08 22:27:33 +0200 |
| commit | fbf8866d65d5de84f75563eb0edd7fc27dbe9a90 (patch) | |
| tree | 150188e64b62233edb22aefe9e57ed90196388da /net/ipv4 | |
| parent | udp: ipv4: Add udp early demux (diff) | |
| download | linux-fbf8866d65d5de84f75563eb0edd7fc27dbe9a90.tar.xz linux-fbf8866d65d5de84f75563eb0edd7fc27dbe9a90.zip | |
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 <sbohrer@rgmadvisors.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 5 | ||||
| -rw-r--r-- | net/ipv4/raw.c | 2 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 2 |
3 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 56e34457ac07..0626f2cb192e 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -1052,11 +1052,12 @@ e_inval: * destination in skb->cb[] before dst drop. * This way, receiver doesnt make cache line misses to read rtable. */ -void ipv4_pktinfo_prepare(struct sk_buff *skb) +void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) { struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); - if (skb_rtable(skb)) { + if ((inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) && + skb_rtable(skb)) { pktinfo->ipi_ifindex = inet_iif(skb); pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); } else { diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index b2fa14c1a6f1..41e1d2845c8f 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -299,7 +299,7 @@ static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) { /* Charge it to the socket. */ - ipv4_pktinfo_prepare(skb); + ipv4_pktinfo_prepare(sk, skb); if (sock_queue_rcv_skb(sk, skb) < 0) { kfree_skb(skb); return NET_RX_DROP; diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 262ea3929da6..4226c53daaed 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1544,7 +1544,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) rc = 0; - ipv4_pktinfo_prepare(skb); + ipv4_pktinfo_prepare(sk, skb); bh_lock_sock(sk); if (!sock_owned_by_user(sk)) rc = __udp_queue_rcv_skb(sk, skb); |