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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/ipv4/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/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 2a246de..ce6c460 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -120,7 +120,7 @@ static inline int __udp_lib_lport_inuse(__u16 num, struct hlist_head udptable[])
struct hlist_node *node;
sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)])
- if (inet_sk(sk)->num == num)
+ if (sk->sk_hash == num)
return 1;
return 0;
}
@@ -191,7 +191,7 @@ gotit:
head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
sk_for_each(sk2, node, head)
- if (inet_sk(sk2)->num == snum &&
+ if (sk2->sk_hash == snum &&
sk2 != sk &&
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
@@ -200,6 +200,7 @@ gotit:
goto fail;
}
inet_sk(sk)->num = snum;
+ sk->sk_hash = snum;
if (sk_unhashed(sk)) {
head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
sk_add_node(sk, head);
@@ -247,7 +248,7 @@ static struct sock *__udp4_lib_lookup(__be32 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 && !ipv6_only_sock(sk)) {
+ if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) {
int score = (sk->sk_family == PF_INET ? 1 : 0);
if (inet->rcv_saddr) {
if (inet->rcv_saddr != daddr)
@@ -296,7 +297,7 @@ static inline struct sock *udp_v4_mcast_next(struct sock *sk,
sk_for_each_from(s, node) {
struct inet_sock *inet = inet_sk(s);
- if (inet->num != hnum ||
+ if (s->sk_hash != hnum ||
(inet->daddr && inet->daddr != rmt_addr) ||
(inet->dport != rmt_port && inet->dport) ||
(inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
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