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| author | Jarek Poplawski <jarkao2@gmail.com> | 2009-01-12 21:54:40 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-01-12 21:54:40 -0800 |
| commit | a73be040650463eacb95f83d2e6673ac57b4fc59 (patch) | |
| tree | ae3958ba9830448e18a0dedc82c8d7c031af2476 /net/sched | |
| parent | c08513471911cf33cb50249a7ff12848374f7263 (diff) | |
| download | linux-3.10-a73be040650463eacb95f83d2e6673ac57b4fc59.tar.gz linux-3.10-a73be040650463eacb95f83d2e6673ac57b4fc59.tar.bz2 linux-3.10-a73be040650463eacb95f83d2e6673ac57b4fc59.zip | |
pkt_sched: sch_htb: Break all htb_do_events() after 2 jiffies
Currently htb_do_events() breaks events recounting for a level after 2
jiffies, but there is no reason to repeat this for next levels and
increase delays even more (with softirqs disabled). htb_dequeue_tree()
can add to this too, btw. In such a case q->now time is invalid anyway.
Thanks to Patrick McHardy for spotting an error around earlier version
of this patch.
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_htb.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 9ca8a26ba50..2f0f0b04d3f 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -661,12 +661,13 @@ static void htb_charge_class(struct htb_sched *q, struct htb_class *cl, * next pending event (0 for no event in pq). * Note: Applied are events whose have cl->pq_key <= q->now. */ -static psched_time_t htb_do_events(struct htb_sched *q, int level) +static psched_time_t htb_do_events(struct htb_sched *q, int level, + unsigned long start) { /* don't run for longer than 2 jiffies; 2 is used instead of 1 to simplify things when jiffy is going to be incremented too soon */ - unsigned long stop_at = jiffies + 2; + unsigned long stop_at = start + 2; while (time_before(jiffies, stop_at)) { struct htb_class *cl; long diff; @@ -845,6 +846,7 @@ static struct sk_buff *htb_dequeue(struct Qdisc *sch) struct htb_sched *q = qdisc_priv(sch); int level; psched_time_t next_event; + unsigned long start_at; /* try to dequeue direct packets as high prio (!) to minimize cpu work */ skb = __skb_dequeue(&q->direct_queue); @@ -857,6 +859,7 @@ static struct sk_buff *htb_dequeue(struct Qdisc *sch) if (!sch->q.qlen) goto fin; q->now = psched_get_time(); + start_at = jiffies; next_event = q->now + 5 * PSCHED_TICKS_PER_SEC; @@ -866,7 +869,7 @@ static struct sk_buff *htb_dequeue(struct Qdisc *sch) psched_time_t event; if (q->now >= q->near_ev_cache[level]) { - event = htb_do_events(q, level); + event = htb_do_events(q, level, start_at); if (!event) event = q->now + PSCHED_TICKS_PER_SEC; q->near_ev_cache[level] = event; |