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net_sched: avoid too many hrtimer_start() calls

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I found a serious performance bug in packet schedulers using hrtimers.

sch_htb and sch_fq are definitely impacted by this problem.

We constantly rearm high resolution timers if some packets are throttled
in one (or more) class, and other packets are flying through qdisc on
another (non throttled) class.

hrtimer_start() does not have the mod_timer() trick of doing nothing if
expires value does not change :

	if (timer_pending(timer) &&
            timer->expires == expires)
                return 1;

This issue is particularly visible when multiple cpus can queue/dequeue
packets on the same qdisc, as hrtimer code has to lock a remote base.

I used following fix :

1) Change htb to use qdisc_watchdog_schedule_ns() instead of open-coding
it.

2) Cache watchdog prior expiration. hrtimer might provide this, but I
prefer to not rely on some hrtimer internal.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-05-23 14:24:56 -07:00 committed by David S. Miller
parent 3275c0c6c5
commit a9efad8b24
3 changed files with 8 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/pkt_sched.h
View File

@ -61,6 +61,7 @@ psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
}
struct qdisc_watchdog {
u64 last_expires;
struct hrtimer timer;
struct Qdisc *qdisc;
};

4
net/sched/sch_api.c
View File

@ -607,6 +607,10 @@ void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool thr
if (throttle)
qdisc_throttled(wd->qdisc);
if (wd->last_expires == expires)
return;
wd->last_expires = expires;
hrtimer_start(&wd->timer,
ns_to_ktime(expires),
HRTIMER_MODE_ABS_PINNED);

13
net/sched/sch_htb.c
View File

@ -928,17 +928,10 @@ ok:
}
}
qdisc_qstats_overlimit(sch);
if (likely(next_event > q->now)) {
if (!test_bit(__QDISC_STATE_DEACTIVATED,
&qdisc_root_sleeping(q->watchdog.qdisc)->state)) {
ktime_t time = ns_to_ktime(next_event);
qdisc_throttled(q->watchdog.qdisc);
hrtimer_start(&q->watchdog.timer, time,
HRTIMER_MODE_ABS_PINNED);
}
} else {
if (likely(next_event > q->now))
qdisc_watchdog_schedule_ns(&q->watchdog, next_event, true);
else
schedule_work(&q->work);
}
fin:
return skb;
}