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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 /include/net | |
| parent | 681d2421e1135b95f5cd9d16fe10eac7f570a9f2 (diff) | |
| download | linux-f2600cf02b5b59aaee082c3485b7f01fc7f7b70c.tar.bz2 | |
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 'include/net')
| -rw-r--r-- | include/net/pkt_sched.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h index e4b3c828c1c2..27a33833ff4a 100644 --- a/include/net/pkt_sched.h +++ b/include/net/pkt_sched.h @@ -65,12 +65,12 @@ struct qdisc_watchdog { }; void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); -void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires); +void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle); static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) { - qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); + qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires), true); } void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); |