netdev - Re: deadlocks if use htb

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Date:	Thu, 15 Jan 2009 12:40:59 +0300
From:	Badalian Vyacheslav <slavon@...telecom.ru>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	Denys Fedoryschenko <denys@...p.net.lb>,
	Chris Caputo <ccaputo@....net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: deadlocks if use htb

Jarek Poplawski пишет:
> On Thu, Jan 15, 2009 at 11:01:14AM +0200, Denys Fedoryschenko wrote:
> ...
>   
>> Jarek, can you give me exact name of patch or link to it?
>> I will test it on production.
>> And i am interested in searching, what is a problem.
>>     
>
> If there is nothing better I could recommend the patch below for
> -stable (2.6.28), when it's tested.
>
> Thanks,
> Jarek P.
> ---
>
> 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;
>
>   

Jarek, i easy can test patch 4 without 2+3 if it needed at heavy
production server. I use dynamic routing and if server crashed - traffic
go to another pc after few seconds. I not test it because you say that
its not needed if for me help 3+2. I apply it today and test at few servers.
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