netdev - Re: deadlocks if use htb

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Date:	Mon, 15 Dec 2008 11:13:08 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Badalian Vyacheslav <slavon@...telecom.ru>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: deadlocks if use htb

On Thu, Dec 11, 2008 at 08:46:06AM +0000, Jarek Poplawski wrote:
> On Wed, Dec 10, 2008 at 06:14:28PM +0300, Badalian Vyacheslav wrote:
> > Hello again! Sorry for long away.
> 
> Hi!
> 
> > I was go away from this work for long time.
> > 
> > May we return to this bug?
> > Servers at last stable kernel 2.6.27.8
> > HZ=1000, HR=off, DynamicTicks=off, hysteresis=1
> > Sorry - no patched, update do not i. Do you have fresh patches or ideas
> > for tests?
> 
> Not much, but I can have if you only are willing to test them...
> I attach below a patch which combines 2 patches I sent yesterday to
> netdev (PATCH 7/6 and 8/6) vs. 2.6.27.7 (named testing patch #3 here).
> 
> You can still try the testing patch #2 I sent previously (quoted below)
> with or without this new #3 patch.
> 

Here is another idea worth checking (instead of patch #2).

Jarek P.

--- (testing patch #4)

diff -Nurp a2.6.27.7/net/sched/sch_htb.c b2.6.27.7/net/sched/sch_htb.c
--- a2.6.27.7/net/sched/sch_htb.c	2008-12-11 08:16:16.000000000 +0000
+++ b2.6.27.7/net/sched/sch_htb.c	2008-12-15 10:44:32.000000000 +0000
@@ -924,6 +924,7 @@ static struct sk_buff *htb_dequeue(struc
 		}
 	}
 	sch->qstats.overlimits++;
+	qdisc_watchdog_cancel(&q->watchdog);
 	qdisc_watchdog_schedule(&q->watchdog, next_event);
 fin:
 	return skb;
--
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