diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-06-11 02:41:39 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-06-11 09:58:21 +0300 |
| commit | 45f50bed1d808794e514e9eed0e579a8756ce2ba (patch) | |
| tree | 05d9f30419d6a5ef9b503487661959ef29c2fec5 /net/sched/sch_htb.c | |
| parent | 42117927cab5a13192ecc227bea19da5059ffc6c (diff) | |
| download | linux-45f50bed1d808794e514e9eed0e579a8756ce2ba.tar.xz | |
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_htb.c')
| -rw-r--r-- | net/sched/sch_htb.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index b74d06668ab4..07dcd2933f01 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -889,7 +889,6 @@ static struct sk_buff *htb_dequeue(struct Qdisc *sch) if (skb != NULL) { ok: qdisc_bstats_update(sch, skb); - qdisc_unthrottled(sch); qdisc_qstats_backlog_dec(sch, skb); sch->q.qlen--; return skb; @@ -929,7 +928,7 @@ ok: } qdisc_qstats_overlimit(sch); if (likely(next_event > q->now)) - qdisc_watchdog_schedule_ns(&q->watchdog, next_event, true); + qdisc_watchdog_schedule_ns(&q->watchdog, next_event); else schedule_work(&q->work); fin: |