netdev - [PATCH 3/6] pkt_sched: sch_htb: Break all htb_do

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Date:	Tue, 9 Dec 2008 10:21:28 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Martin Devera <devik@....cz>, Patrick McHardy <kaber@...sh.net>,
	netdev@...r.kernel.org
Subject: [PATCH 3/6] pkt_sched: sch_htb: Break all htb_do_events() after 2
	jiifies

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.

Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
---
 net/sched/sch_htb.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 102866d..b241ac6 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;
@@ -871,7 +872,7 @@ 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;
-- 
1.5.6.5

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