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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-03-22 12:17:42 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:27:22 -0700 |
| commit | 11274e5a43266d531140530adebead6903380caf (patch) | |
| tree | 38c365a3835c9e5973fb1941a31dde8cc4856724 /net/sched/sch_api.c | |
| parent | 075aa573b74a732aeff487ab77d3fbd627c10856 (diff) | |
| download | lwn-11274e5a43266d531140530adebead6903380caf.tar.gz lwn-11274e5a43266d531140530adebead6903380caf.zip | |
[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 <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_api.c')
| -rw-r--r-- | net/sched/sch_api.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index b06f20294ac0..fcaa4adefc82 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -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); |