netdev - [PATCH 7/6 resend] pkt_sched: sch_htb: Consider used jiffies in htb_do

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090112101613.GA5781@ff.dom.local>
Date:	Mon, 12 Jan 2009 10:16:13 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	kaber@...sh.net, devik@....cz, netdev@...r.kernel.org
Subject: [PATCH 7/6 resend] pkt_sched: sch_htb: Consider used jiffies in
	htb_do_events()

(resend)

pkt_sched: sch_htb: Consider used jiffies in htb_do_events()

Next event time should consider jiffies used for recounting. Otherwise
qdisc_watchdog_schedule() triggers hrtimer immediately with the event
in the past, and may cause very high ksoftirqd cpu usage (if highres
is on).

There is also removed checking "event" for zero in htb_dequeue(): it's
always true in this place.

Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
---

 net/sched/sch_htb.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 5070643..9ca8a26 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -685,8 +685,8 @@ 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);
 	}
-	/* too much load - let's continue on next jiffie */
-	return q->now + PSCHED_TICKS_PER_SEC / HZ;
+	/* too much load - let's continue on next jiffie (including above) */
+	return q->now + 2 * PSCHED_TICKS_PER_SEC / HZ;
 }
 
 /* Returns class->node+prio from id-tree where classe's id is >= id. NULL
@@ -873,7 +873,7 @@ static struct sk_buff *htb_dequeue(struct Qdisc *sch)
 		} else
 			event = q->near_ev_cache[level];
 
-		if (event && next_event > event)
+		if (next_event > event)
 			next_event = event;
 
 		m = ~q->row_mask[level];
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html