LARTC - May 2003 - Re: 2.4.20 htb3 oops

I''ve also encountered machine-lockups once a day with stock 2.4.20
kernel and
htb on SMP. I am using a setup with dynamically changing classes and have 
about 2-4mbit traffic. I was using 2.4.17, 2.4.18 and 2.4.19 with htb 3.6 
without problems before (other machine - not SMP though). Unfortunately I 
wasn''t able to gather any debugging information on the crashes because 
getting the system up again was my primary concern. Since I have disabled all 
tc stuff on that machine it runs flawlessly (about a week now). I will soon 
try to reproduce the problem on another machine.

Might the changes to htb in 2.4.21 be a solution? Is there any evidence that 
SMP might cause problems with htb?

Any hints would be greatly appreciated!

        Andreas

On Tuesday 11 March 2003 09:52, Göran Runfeldt wrote:
> > Any solution to the problems describe above? Im currently looking into
> > building a new kernel 2.4.20 with HTB compiled as module in a
> > production enviroment (2,5mbits average, 6-10mbits/peak). I wont use
> > it if its broken though?
>
> Unfortunately we have not yet come to a solution when it comes to our
> problems.
>
> We have had the machines running for more than five days now, without any
> HTB qdisc/classes loaded. This confirms that this is a problem with HTB.
> I have activated the rules again in hope of getting a useful crash dump.
>
> I do not know if anyone else has or will have this problem. All I know is
> that we have the problem over here.
>
> Göran
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On Tue, 6 May 2003 18:10:04 +0200
Kabelweb <office@kabelweb.at> wrote:
> I''ve also encountered machine-lockups once a day with stock 2.4.20
kernel and
> htb on SMP. I am using a setup with dynamically changing classes and have 
> about 2-4mbit traffic. I was using 2.4.17, 2.4.18 and 2.4.19 with htb 3.6 
> without problems before (other machine - not SMP though). Unfortunately I 
> wasn''t able to gather any debugging information on the crashes
because
> getting the system up again was my primary concern. Since I have disabled
all
> tc stuff on that machine it runs flawlessly (about a week now). I will soon
> try to reproduce the problem on another machine.
> 
> Might the changes to htb in 2.4.21 be a solution? Is there any evidence
that
> SMP might cause problems with htb?
> 
> Any hints would be greatly appreciated!

Hello,

In 2.4.20 there is a bug in htb code, which was fixed in 2.4.21pre5 (or was it
pre6?). You can use net/sched/sch_htb.c from 2.4.21rc1. For details see this
thread in lkml:
http://marc.theaimsgroup.com/?l=linux-kernel&m=105039488700308&w=2

-- 
Martin Volf
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