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authorEric Dumazet <dada1@cosmosbay.com>2005-10-03 17:13:38 -0400
committerDavid S. Miller <davem@davemloft.net>2005-10-03 17:13:38 -0400
commit81c3d5470ecc70564eb9209946730fe2be93ad06 (patch)
tree1efa553c305a6453769dacfaf580bc6ccf146d82 /net/ipv4/inet_timewait_sock.c
parent399de50bbbb2501a6db43daaa8a2dafbc9bcfe0c (diff)
[INET]: speedup inet (tcp/dccp) lookups
Arnaldo and I agreed it could be applied now, because I have other pending patches depending on this one (Thank you Arnaldo) (The other important patch moves skc_refcnt in a separate cache line, so that the SMP/NUMA performance doesnt suffer from cache line ping pongs) 1) First some performance data : -------------------------------- tcp_v4_rcv() wastes a *lot* of time in __inet_lookup_established() The most time critical code is : sk_for_each(sk, node, &head->chain) { if (INET_MATCH(sk, acookie, saddr, daddr, ports, dif)) goto hit; /* You sunk my battleship! */ } The sk_for_each() does use prefetch() hints but only the begining of "struct sock" is prefetched. As INET_MATCH first comparison uses inet_sk(__sk)->daddr, wich is far away from the begining of "struct sock", it has to bring into CPU cache cold cache line. Each iteration has to use at least 2 cache lines. This can be problematic if some chains are very long. 2) The goal ----------- The idea I had is to change things so that INET_MATCH() may return FALSE in 99% of cases only using the data already in the CPU cache, using one cache line per iteration. 3) Description of the patch --------------------------- Adds a new 'unsigned int skc_hash' field in 'struct sock_common', filling a 32 bits hole on 64 bits platform. struct sock_common { unsigned short skc_family; volatile unsigned char skc_state; unsigned char skc_reuse; int skc_bound_dev_if; struct hlist_node skc_node; struct hlist_node skc_bind_node; atomic_t skc_refcnt; + unsigned int skc_hash; struct proto *skc_prot; }; Store in this 32 bits field the full hash, not masked by (ehash_size - 1) Using this full hash as the first comparison done in INET_MATCH permits us immediatly skip the element without touching a second cache line in case of a miss. Suppress the sk_hashent/tw_hashent fields since skc_hash (aliased to sk_hash and tw_hash) already contains the slot number if we mask with (ehash_size - 1) File include/net/inet_hashtables.h 64 bits platforms : #define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\ (((__sk)->sk_hash == (__hash)) ((*((__u64 *)&(inet_sk(__sk)->daddr)))== (__cookie)) && \ ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \ (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 32bits platforms: #define TCP_IPV4_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\ (((__sk)->sk_hash == (__hash)) && \ (inet_sk(__sk)->daddr == (__saddr)) && \ (inet_sk(__sk)->rcv_saddr == (__daddr)) && \ (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) - Adds a prefetch(head->chain.first) in __inet_lookup_established()/__tcp_v4_check_established() and __inet6_lookup_established()/__tcp_v6_check_established() and __dccp_v4_check_established() to bring into cache the first element of the list, before the {read|write}_lock(&head->lock); Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Acked-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_timewait_sock.c')
-rw-r--r--net/ipv4/inet_timewait_sock.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 4d1502a49852..f9076ef3a1a8 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -20,7 +20,7 @@ void __inet_twsk_kill(struct inet_timewait_sock *tw, struct inet_hashinfo *hashi
20 struct inet_bind_hashbucket *bhead; 20 struct inet_bind_hashbucket *bhead;
21 struct inet_bind_bucket *tb; 21 struct inet_bind_bucket *tb;
22 /* Unlink from established hashes. */ 22 /* Unlink from established hashes. */
23 struct inet_ehash_bucket *ehead = &hashinfo->ehash[tw->tw_hashent]; 23 struct inet_ehash_bucket *ehead = inet_ehash_bucket(hashinfo, tw->tw_hash);
24 24
25 write_lock(&ehead->lock); 25 write_lock(&ehead->lock);
26 if (hlist_unhashed(&tw->tw_node)) { 26 if (hlist_unhashed(&tw->tw_node)) {
@@ -60,7 +60,7 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
60{ 60{
61 const struct inet_sock *inet = inet_sk(sk); 61 const struct inet_sock *inet = inet_sk(sk);
62 const struct inet_connection_sock *icsk = inet_csk(sk); 62 const struct inet_connection_sock *icsk = inet_csk(sk);
63 struct inet_ehash_bucket *ehead = &hashinfo->ehash[sk->sk_hashent]; 63 struct inet_ehash_bucket *ehead = inet_ehash_bucket(hashinfo, sk->sk_hash);
64 struct inet_bind_hashbucket *bhead; 64 struct inet_bind_hashbucket *bhead;
65 /* Step 1: Put TW into bind hash. Original socket stays there too. 65 /* Step 1: Put TW into bind hash. Original socket stays there too.
66 Note, that any socket with inet->num != 0 MUST be bound in 66 Note, that any socket with inet->num != 0 MUST be bound in
@@ -106,7 +106,7 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int stat
106 tw->tw_dport = inet->dport; 106 tw->tw_dport = inet->dport;
107 tw->tw_family = sk->sk_family; 107 tw->tw_family = sk->sk_family;
108 tw->tw_reuse = sk->sk_reuse; 108 tw->tw_reuse = sk->sk_reuse;
109 tw->tw_hashent = sk->sk_hashent; 109 tw->tw_hash = sk->sk_hash;
110 tw->tw_ipv6only = 0; 110 tw->tw_ipv6only = 0;
111 tw->tw_prot = sk->sk_prot_creator; 111 tw->tw_prot = sk->sk_prot_creator;
112 atomic_set(&tw->tw_refcnt, 1); 112 atomic_set(&tw->tw_refcnt, 1);