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| author |   Eric Dumazet <edumazet@google.com> | 2014-10-04 10:11:31 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-10-06 00:55:10 -0400 |
| commit | f2600cf02b5b59aaee082c3485b7f01fc7f7b70c (patch) | |
| tree | f38d692c3f706ead3d0cfd77b216fbd629a22964 /net/sched/sch_api.c | |
| parent | fec: Fix fec_enet_alloc_buffers() error path (diff) | |
| download | linux-dev-f2600cf02b5b59aaee082c3485b7f01fc7f7b70c.tar.xz linux-dev-f2600cf02b5b59aaee082c3485b7f01fc7f7b70c.zip | |
net: sched: avoid costly atomic operation in fq_dequeue()
Standard qdisc API to setup a timer implies an atomic operation on every
packet dequeue : qdisc_unthrottled()
It turns out this is not really needed for FQ, as FQ has no concept of
global qdisc throttling, being a qdisc handling many different flows,
some of them can be throttled, while others are not.
Fix is straightforward : add a 'bool throttle' to
qdisc_watchdog_schedule_ns(), and remove calls to qdisc_unthrottled()
in sch_fq.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | net/sched/sch_api.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index c79a226cc25c..2cf61b3e633c 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -594,13 +594,14 @@ void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) } EXPORT_SYMBOL(qdisc_watchdog_init); -void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) +void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle) { if (test_bit(__QDISC_STATE_DEACTIVATED, &qdisc_root_sleeping(wd->qdisc)->state)) return; - qdisc_throttled(wd->qdisc); + if (throttle) + qdisc_throttled(wd->qdisc); hrtimer_start(&wd->timer, ns_to_ktime(expires), |