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authorEric Dumazet <dada1@cosmosbay.com>2007-02-09 15:44:52 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-02-10 23:20:29 -0800
commit95f30b336b944e3e418f825044b4793d9e9aac09 (patch)
tree4faf8cc7a061fdf7d85f94768ca1150f8580e700 /net/ipv6/udp.c
parent4768fbcbcfbbcacb785ae08eef33767a0b4fdcdd (diff)
downloadop-kernel-dev-95f30b336b944e3e418f825044b4793d9e9aac09.zip
op-kernel-dev-95f30b336b944e3e418f825044b4793d9e9aac09.tar.gz
[UDP]: UDP can use sk_hash to speedup lookups
In a prior patch, I introduced a sk_hash field (__sk_common.skc_hash) to let tcp lookups use one cache line per unmatched entry instead of two. We can also use sk_hash to speedup UDP part as well. We store in sk_hash the hnum value, and use sk->sk_hash (same cache line than 'next' pointer), instead of inet->num (different cache line) Note : We still have a false sharing problem for SMP machines, because sock_hold(sock) dirties the cache line containing the 'next' pointer. Not counting the udp_hash_lock rwlock. (did someone mentioned RCU ? :) ) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index dbe2748..ccf2f4d 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -71,7 +71,7 @@ static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
struct inet_sock *inet = inet_sk(sk);
- if (inet->num == hnum && sk->sk_family == PF_INET6) {
+ if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) {
struct ipv6_pinfo *np = inet6_sk(sk);
int score = 0;
if (inet->dport) {
@@ -309,7 +309,7 @@ static struct sock *udp_v6_mcast_next(struct sock *sk,
sk_for_each_from(s, node) {
struct inet_sock *inet = inet_sk(s);
- if (inet->num == num && s->sk_family == PF_INET6) {
+ if (s->sk_hash == num && s->sk_family == PF_INET6) {
struct ipv6_pinfo *np = inet6_sk(s);
if (inet->dport) {
if (inet->dport != rmt_port)
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