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[NETEM]: Optimize tfifo 

In most cases, the next packet will be sent after the
last one. So optimize that case.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-03-22 12:17:05 -07:00 committed by David S. Miller
parent b407621c35
commit 075aa573b7
1 changed files with 11 additions and 4 deletions
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15
net/sched/sch_netem.c
View File

@ -479,22 +479,28 @@ static int netem_change(struct Qdisc *sch, struct rtattr *opt)
*/
struct fifo_sched_data {
u32 limit;
psched_time_t oldest;
};
static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch)
{
struct fifo_sched_data *q = qdisc_priv(sch);
struct sk_buff_head *list = &sch->q;
const struct netem_skb_cb *ncb
= (const struct netem_skb_cb *)nskb->cb;
psched_time_t tnext = ((struct netem_skb_cb *)nskb->cb)->time_to_send;
struct sk_buff *skb;
if (likely(skb_queue_len(list) < q->limit)) {
/* Optimize for add at tail */
if (likely(skb_queue_empty(list) || !PSCHED_TLESS(tnext, q->oldest))) {
q->oldest = tnext;
return qdisc_enqueue_tail(nskb, sch);
}
skb_queue_reverse_walk(list, skb) {
const struct netem_skb_cb *cb
= (const struct netem_skb_cb *)skb->cb;
if (!PSCHED_TLESS(ncb->time_to_send, cb->time_to_send))
if (!PSCHED_TLESS(tnext, cb->time_to_send))
break;
}
@ -507,7 +513,7 @@ static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch)
return NET_XMIT_SUCCESS;
}
return qdisc_drop(nskb, sch);
return qdisc_reshape_fail(nskb, sch);
}
static int tfifo_init(struct Qdisc *sch, struct rtattr *opt)
@ -523,6 +529,7 @@ static int tfifo_init(struct Qdisc *sch, struct rtattr *opt)
} else
q->limit = max_t(u32, sch->dev->tx_queue_len, 1);
PSCHED_SET_PASTPERFECT(q->oldest);
return 0;
}