From: Eric Dumazet <dada1@cosmosbay•com>
To: "David S. Miller" <davem@davemloft•net>
Cc: netdev@oss•sgi.com
Subject: [PATCH] loop unrolling in net/sched/sch_generic.c
Date: Tue, 05 Jul 2005 09:38:52 +0200 [thread overview]
Message-ID: <42CA390C.9000801@cosmosbay.com> (raw)
In-Reply-To: <20050704.160140.21591849.davem@davemloft.net>
[-- Attachment #1: Type: text/plain, Size: 305 bytes --]
[NET] : unroll a small loop in pfifo_fast_dequeue(). Compiler generates better code.
(Using skb_queue_empty() to test the queue is faster than trying to __skb_dequeue())
oprofile says this function uses now 0.29% instead of 1.22 %, on a x86_64 target.
Signed-off-by: Eric Dumazet <dada1@cosmosbay•com>
[-- Attachment #2: patch.sch_generic --]
[-- Type: text/plain, Size: 1022 bytes --]
--- linux-2.6.12/net/sched/sch_generic.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6.12-ed/net/sched/sch_generic.c 2005-07-05 09:11:30.000000000 +0200
@@ -333,18 +333,23 @@
static struct sk_buff *
pfifo_fast_dequeue(struct Qdisc* qdisc)
{
- int prio;
struct sk_buff_head *list = qdisc_priv(qdisc);
struct sk_buff *skb;
- for (prio = 0; prio < 3; prio++, list++) {
- skb = __skb_dequeue(list);
- if (skb) {
- qdisc->q.qlen--;
- return skb;
- }
+ for (;;) {
+ if (!skb_queue_empty(list))
+ break;
+ list++;
+ if (!skb_queue_empty(list))
+ break;
+ list++;
+ if (!skb_queue_empty(list))
+ break;
+ return NULL;
}
- return NULL;
+ skb = __skb_dequeue(list);
+ qdisc->q.qlen--;
+ return skb;
}
static int
next prev parent reply other threads:[~2005-07-05 7:38 UTC|newest]
Thread overview: 64+ 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 ` Eric Dumazet [this message]
2005-07-05 11:51 ` [PATCH] loop unrolling in net/sched/sch_generic.c 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 ` [PATCH] Add prefetches in net/ipv4/route.c Eric Dumazet
2005-07-28 19:39 ` 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
[not found] <C925F8B43D79CC49ACD0601FB68FF50C045E0FB0@orsmsx408>
2005-07-07 22:30 ` [PATCH] loop unrolling in net/sched/sch_generic.c David S. Miller
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