From: Eric Dumazet <dada1@cosmosbay•com>
To: "David S. Miller" <davem@davemloft•net>
Cc: netdev@oss•sgi.com
Subject: [PATCH] Add prefetches in net/ipv4/route.c
Date: Thu, 28 Jul 2005 17:52:04 +0200 [thread overview]
Message-ID: <42E8FF24.9070009@cosmosbay.com> (raw)
In-Reply-To: <42CA390C.9000801@cosmosbay.com>
[-- Attachment #1: Type: text/plain, Size: 219 bytes --]
[NET] : Adds prefetches in route hash list traversals.
The actual code doesnt use a prefetch enabled macro like list_for_each_rcu(), so manually
add prefetch() hints.
Signed-off-by: Eric Dumazet <dada1@cosmosbay•com>
[-- Attachment #2: route.prefetches --]
[-- Type: text/plain, Size: 1606 bytes --]
diff -Nru linux-2.6.13-rc3/net/ipv4/route.c linux-2.6.13-rc3-ed/net/ipv4/route.c
--- linux-2.6.13-rc3/net/ipv4/route.c 2005-07-13 06:46:46.000000000 +0200
+++ linux-2.6.13-rc3-ed/net/ipv4/route.c 2005-07-28 17:20:21.000000000 +0200
@@ -1148,6 +1148,7 @@
while ((rth = rcu_dereference(*rthp)) != NULL) {
struct rtable *rt;
+ prefetch(rth->u.rt_next);
if (rth->fl.fl4_dst != daddr ||
rth->fl.fl4_src != skeys[i] ||
rth->fl.fl4_tos != tos ||
@@ -1401,6 +1402,7 @@
rcu_read_lock();
for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
rth = rcu_dereference(rth->u.rt_next)) {
+ prefetch(rth->u.rt_next);
if (rth->fl.fl4_dst == daddr &&
rth->fl.fl4_src == skeys[i] &&
rth->rt_dst == daddr &&
@@ -2094,6 +2096,7 @@
rcu_read_lock();
for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
rth = rcu_dereference(rth->u.rt_next)) {
+ prefetch(rth->u.rt_next);
if (rth->fl.fl4_dst == daddr &&
rth->fl.fl4_src == saddr &&
rth->fl.iif == iif &&
@@ -2565,6 +2568,7 @@
rcu_read_lock_bh();
for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
rth = rcu_dereference(rth->u.rt_next)) {
+ prefetch(rth->u.rt_next);
if (rth->fl.fl4_dst == flp->fl4_dst &&
rth->fl.fl4_src == flp->fl4_src &&
rth->fl.iif == 0 &&
@@ -2819,6 +2823,7 @@
rcu_read_lock_bh();
for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt;
rt = rcu_dereference(rt->u.rt_next), idx++) {
+ prefetch(rt->u.rt_next);
if (idx < s_idx)
continue;
skb->dst = dst_clone(&rt->u.dst);
next prev parent reply other threads:[~2005-07-28 15:52 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-11 21:15 [TG3]: Add hw coalescing infrastructure David S. Miller
2005-05-11 21:17 ` Michael Chan
2005-05-12 2:28 ` David S. Miller
2005-05-12 7:53 ` Robert Olsson
2005-06-22 15:25 ` [TG3]: About " Eric Dumazet
2005-06-22 19:03 ` Michael Chan
2005-07-04 21:22 ` Eric Dumazet
2005-07-04 21:26 ` David S. Miller
2005-07-04 21:39 ` Eric Dumazet
2005-07-04 21:49 ` David S. Miller
2005-07-04 22:31 ` Eric Dumazet
2005-07-04 22:47 ` David S. Miller
2005-07-04 22:55 ` Eric Dumazet
2005-07-04 22:57 ` Eric Dumazet
2005-07-04 23:01 ` David S. Miller
2005-07-05 7:38 ` [PATCH] loop unrolling in net/sched/sch_generic.c Eric Dumazet
2005-07-05 11:51 ` Thomas Graf
2005-07-05 12:03 ` Thomas Graf
2005-07-05 13:04 ` Eric Dumazet
2005-07-05 13:48 ` Thomas Graf
2005-07-05 15:58 ` Eric Dumazet
2005-07-05 17:34 ` Thomas Graf
2005-07-05 21:22 ` David S. Miller
2005-07-05 21:33 ` Thomas Graf
2005-07-05 21:35 ` David S. Miller
2005-07-05 23:16 ` Eric Dumazet
2005-07-05 23:41 ` Thomas Graf
2005-07-05 23:45 ` David S. Miller
2005-07-05 23:55 ` Thomas Graf
2005-07-06 0:32 ` Eric Dumazet
2005-07-06 0:51 ` Thomas Graf
2005-07-06 1:04 ` Eric Dumazet
2005-07-06 1:07 ` Thomas Graf
2005-07-06 0:53 ` Eric Dumazet
2005-07-06 1:02 ` Thomas Graf
2005-07-06 1:09 ` Eric Dumazet
2005-07-06 12:42 ` Thomas Graf
2005-07-07 21:17 ` David S. Miller
2005-07-07 21:34 ` Thomas Graf
2005-07-07 22:24 ` David S. Miller
[not found] ` <42CE22CE.7030902@cosmosbay.com>
2005-07-08 7:30 ` David S. Miller
2005-07-08 8:19 ` Eric Dumazet
2005-07-08 11:08 ` Arnaldo Carvalho de Melo
2005-07-12 4:02 ` David S. Miller
2005-07-05 21:26 ` David S. Miller
2005-07-28 15:52 ` Eric Dumazet [this message]
2005-07-28 19:39 ` [PATCH] Add prefetches in net/ipv4/route.c David S. Miller
2005-07-28 20:56 ` Eric Dumazet
2005-07-28 20:58 ` David S. Miller
2005-07-28 21:24 ` Eric Dumazet
2005-07-28 22:44 ` David S. Miller
2005-07-29 14:50 ` Robert Olsson
2005-07-29 17:06 ` Rick Jones
2005-07-29 17:44 ` Robert Olsson
2005-07-29 17:57 ` Eric Dumazet
2005-07-29 18:25 ` Rick Jones
2005-07-31 3:52 ` David S. Miller
[not found] ` <42EDDA50.4010405@cosmosbay.com>
2005-08-01 15:39 ` David S. Miller
2005-07-31 3:51 ` David S. Miller
2005-07-31 3:44 ` David S. Miller
2005-07-04 23:00 ` [TG3]: About hw coalescing infrastructure David S. Miller
2005-07-05 16:14 ` Eric Dumazet
2005-07-04 22:47 ` Eric Dumazet
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