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[NETEM]: avoid excessive requeues

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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 <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2007-03-22 12:17:42 -07:00
committed by David S. Miller
parent 075aa573b7
commit 11274e5a43
2 changed files with 16 additions and 10 deletions
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3
net/sched/sch_api.c
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@@ -298,6 +298,7 @@ static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
timer);
wd->qdisc->flags &= ~TCQ_F_THROTTLED;
smp_wmb();
netif_schedule(wd->qdisc->dev);
return HRTIMER_NORESTART;
}
@@ -315,6 +316,7 @@ void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires)
ktime_t time;
wd->qdisc->flags |= TCQ_F_THROTTLED;
smp_wmb();
time = ktime_set(0, 0);
time = ktime_add_ns(time, PSCHED_US2NS(expires));
hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS);
@@ -325,6 +327,7 @@ void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
{
hrtimer_cancel(&wd->timer);
wd->qdisc->flags &= ~TCQ_F_THROTTLED;
smp_wmb();
}
EXPORT_SYMBOL(qdisc_watchdog_cancel);