Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=075aa573b74a732aeff487ab77d3fbd627c10856 Commit: 075aa573b74a732aeff487ab77d3fbd627c10856 Parent: b407621c35ed5f9a0734e57472e9539117963768 Author: Stephen Hemminger <[EMAIL PROTECTED]> AuthorDate: Thu Mar 22 12:17:05 2007 -0700 Committer: David S. Miller <[EMAIL PROTECTED]> CommitDate: Wed Apr 25 22:27:21 2007 -0700
[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 <[EMAIL PROTECTED]> Signed-off-by: David S. Miller <[EMAIL PROTECTED]> --- net/sched/sch_netem.c | 15 +++++++++++---- 1 files changed, 11 insertions(+), 4 deletions(-) diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 4ac6df0..7e9e658 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -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; } - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html