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authorEric Dumazet <edumazet@google.com>2016-06-10 16:41:39 -0700
committerDavid S. Miller <davem@davemloft.net>2016-06-10 23:58:21 -0700
commit45f50bed1d808794e514e9eed0e579a8756ce2ba (patch)
tree05d9f30419d6a5ef9b503487661959ef29c2fec5 /net/sched/sch_api.c
parent42117927cab5a13192ecc227bea19da5059ffc6c (diff)
downloadlinux-45f50bed1d808794e514e9eed0e579a8756ce2ba.tar.bz2
net_sched: remove generic throttled management
__QDISC_STATE_THROTTLED bit manipulation is rather expensive for HTB and few others. I already removed it for sch_fq in commit f2600cf02b5b ("net: sched: avoid costly atomic operation in fq_dequeue()") and so far nobody complained. When one ore more packets are stuck in one or more throttled HTB class, a htb dequeue() performs two atomic operations to clear/set __QDISC_STATE_THROTTLED bit, while root qdisc lock is held. Removing this pair of atomic operations bring me a 8 % performance increase on 200 TCP_RR tests, in presence of throttled classes. This patch has no side effect, since nothing actually uses disc_is_throttled() anymore. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_api.c')
-rw-r--r--net/sched/sch_api.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index d4a8bbfcc953..401eda6de682 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -583,7 +583,6 @@ static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
timer);
rcu_read_lock();
- qdisc_unthrottled(wd->qdisc);
__netif_schedule(qdisc_root(wd->qdisc));
rcu_read_unlock();
@@ -598,15 +597,12 @@ 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, bool throttle)
+void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
{
if (test_bit(__QDISC_STATE_DEACTIVATED,
&qdisc_root_sleeping(wd->qdisc)->state))
return;
- if (throttle)
- qdisc_throttled(wd->qdisc);
-
if (wd->last_expires == expires)
return;
@@ -620,7 +616,6 @@ EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
{
hrtimer_cancel(&wd->timer);
- qdisc_unthrottled(wd->qdisc);
}
EXPORT_SYMBOL(qdisc_watchdog_cancel);