From 11274e5a43266d531140530adebead6903380caf Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 22 Mar 2007 12:17:42 -0700 Subject: [NETEM]: avoid excessive requeues The netem code would call getnstimeofday() and dequeue/requeue after every packet, even if it was waiting. Avoid this overhead by using the throttled flag. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/sched/sch_netem.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) (limited to 'net/sched/sch_netem.c') diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 7e9e658d4d9..fb49e9e7ace 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -273,6 +273,10 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch) struct netem_sched_data *q = qdisc_priv(sch); struct sk_buff *skb; + smp_mb(); + if (sch->flags & TCQ_F_THROTTLED) + return NULL; + skb = q->qdisc->dequeue(q->qdisc); if (skb) { const struct netem_skb_cb *cb @@ -285,18 +289,17 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch) if (PSCHED_TLESS(cb->time_to_send, now)) { pr_debug("netem_dequeue: return skb=%p\n", skb); sch->q.qlen--; - sch->flags &= ~TCQ_F_THROTTLED; return skb; - } else { - qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send); - - if (q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS) { - qdisc_tree_decrease_qlen(q->qdisc, 1); - sch->qstats.drops++; - printk(KERN_ERR "netem: queue discpline %s could not requeue\n", - q->qdisc->ops->id); - } } + + if (unlikely(q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS)) { + qdisc_tree_decrease_qlen(q->qdisc, 1); + sch->qstats.drops++; + printk(KERN_ERR "netem: %s could not requeue\n", + q->qdisc->ops->id); + } + + qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send); } return NULL; -- cgit v1.2.3-70-g09d2