sch_htb: fix "too many events" situation (8f3ea33a) · Commits · 戴 / test

HTB is event driven algorithm and part of its work is to apply scheduled events at proper times. It tried to defend itself from livelock by processing only limited number of events per dequeue. Because of faster computers some users already hit this hardcoded limit. This patch limits processing up to 2 jiffies (why not 1 jiffie ? because it might stop prematurely when only fraction of jiffie remains). Signed-off-by:

Martin Devera <devik@cdi.cz> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/sched/sch_htb.c

+7 −6

Original line number	Diff line number	Diff line
		@@ -711,9 +711,11 @@ static void htb_charge_class(struct htb_sched q, struct htb_class cl,
		*/
		static psched_time_t htb_do_events(struct htb_sched *q, int level)
		{
		int i;

		for (i = 0; i < 500; i++) {
		/* 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;
		while (time_before(jiffies, stop_at)) {
		struct htb_class *cl;
		long diff;
		struct rb_node *p = rb_first(&q->wait_pq[level]);
		@@ -731,9 +733,8 @@ static psched_time_t htb_do_events(struct htb_sched *q, int level)
		if (cl->cmode != HTB_CAN_SEND)
		htb_add_to_wait_tree(q, cl, diff);
		}
		if (net_ratelimit())
		printk(KERN_WARNING "htb: too many events !\n");
		return q->now + PSCHED_TICKS_PER_SEC / 10;
		/* too much load - let's continue on next jiffie */
		return q->now + PSCHED_TICKS_PER_SEC / HZ;
		}

		/* Returns class->node+prio from id-tree where classe's id is >= id. NULL

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