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* [LARTC] tc reliably hangs my system
@ 2002-07-03 16:33 Dimitris Zilaskos
  2002-07-03 16:47 ` Stef Coene
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: Dimitris Zilaskos @ 2002-07-03 16:33 UTC (permalink / raw)
  To: lartc


 kernel 2.4.18-ac3 smp , iproute2-2.4.7-now-ss020116-try.tar.gz

 I am using the following scripts to adjust my traffic during certain
periods of time , running them cron and sometimes by hand . They can
reliably freeze the system if they are run  certain number of times .
No oops/panic/errors of whatsoever , just a frozen system .

the following "fast" script freezes the system after it is executed 7-8
times

tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 10: cbq bandwidth 100Mbit avpkt 1000
tc class add dev eth0 parent 10:0 classid 10:1 cbq bandwidth 100Mbit \
rate 100Mbit allot 1514 weight 10Mbit prio 8 maxburst 20 avpkt 1000
tc class add dev eth0 parent 10:1 classid 10:100 cbq bandwidth 100Mbit \
rate 100Mbit allot 1514 weight 10Mbit prio 5 maxburst 20 avpkt 1000
tc class add dev eth0 parent 10:1 classid 10:200 cbq bandwidth 100Mbit \
rate 100Mbit allot 1514 weight 10Mbit prio 5 maxburst 20 avpkt 1000

tc qdisc add dev eth0 parent 10:100 sfq quantum 1514b perturb 10
tc qdisc add dev eth0 parent 10:200 tbf rate 6Mbit latency 50ms burst \
50000
tc qdisc del dev eth0 ingress
tc qdisc add dev eth0 handle ffff: ingress
tc filter add dev eth0 parent ffff: protocol ip prio 2 u32 match ip \
protocol 1 0xFF police rate 1kbit burst 10000 mtu 1k drop flowid :1

tc filter add dev eth0 parent 10: protocol ip prio 1 u32 match ip dst \
1.2.3.0/16 flowid 10:100
tc filter add dev eth0 parent 10: protocol ip prio 1 u32 match tcp src \
22 0xffff match ip protocol 0x6 0xff flowid 10:100
tc filter add dev eth0 parent 10: protocol ip prio 1 u32 match ip src \
1.2.3.25/32 flowid 10:200


 The following "slow" script freezes the system after being executed
around 11-18 times

tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 10: cbq bandwidth 100Mbit avpkt 1000
tc class add dev eth0 parent 10:0 classid 10:1 cbq bandwidth 100Mbit \
rate 100Mbit allot 1514 weight 10Mbit prio 8 maxburst 20 avpkt 1000
tc class add dev eth0 parent 10:1 classid 10:100 cbq bandwidth 100Mbit \
rate 100Mbit allot 1514 weight 10Mbit prio 5 maxburst 20 avpkt 1000
tc class add dev eth0 parent 10:1 classid 10:200 cbq bandwidth 100Mbit \
rate 100Mbit allot 1514 weight 10Mbit prio 5 maxburst 20 avpkt 1000

tc qdisc add dev eth0 parent 10:100 sfq quantum 1514b perturb 10
tc qdisc add dev eth0 parent 10:200 tbf rate 3Mbit latency 50ms burst \
50000
tc qdisc del dev eth0 ingress
tc qdisc add dev eth0 handle ffff: ingress
tc filter add dev eth0 parent ffff: protocol ip prio 2 u32 match ip \
protocol 1 0xFF police rate 1kbit burst 10000 mtu 1k drop flowid :1

tc filter add dev eth0 parent 10: protocol ip prio 1 u32 match ip dst \
1.2.3.0/16 flowid 10:100
tc filter add dev eth0 parent 10: protocol ip prio 1 u32 match tcp src \
22 0xffff match ip protocol 0x6 0xff flowid 10:100

tc filter add dev eth0 parent 10: protocol ip prio 1 u32 match ip src \
1.2.3.25/32 flowid 10:200


 The ingress related parts are the prime suspects for me , i added them
recently . Before that no freezing has ever ocurred . I couldn't perform
more tests because the box is a rather busy server and the lockups cause
painfull reboots .

  Any advice is welcomed .

Kind regards ,
--
======================================
Dimitris Zilaskos

Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
======================================
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [LARTC] tc reliably hangs my system
  2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
@ 2002-07-03 16:47 ` Stef Coene
  2002-07-04  8:07 ` Dimitris Zilaskos
                   ` (5 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Stef Coene @ 2002-07-03 16:47 UTC (permalink / raw)
  To: lartc

On Wednesday 03 July 2002 18:33, Dimitris Zilaskos wrote:
>  kernel 2.4.18-ac3 smp , iproute2-2.4.7-now-ss020116-try.tar.gz
>
>  I am using the following scripts to adjust my traffic during certain
> periods of time , running them cron and sometimes by hand . They can
> reliably freeze the system if they are run  certain number of times .
> No oops/panic/errors of whatsoever , just a frozen system .
>
>  The ingress related parts are the prime suspects for me , i added them
> recently . Before that no freezing has ever ocurred . I couldn't perform
> more tests because the box is a rather busy server and the lockups cause
> painfull reboots .
>
>   Any advice is welcomed .
I ran both scripts for 10 minutes (while true; do ./test.sh; sleep 5; done) 
and no freeze for me.

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.openprojects.net
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [LARTC] tc reliably hangs my system
  2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
  2002-07-03 16:47 ` Stef Coene
@ 2002-07-04  8:07 ` Dimitris Zilaskos
  2002-07-04 10:07 ` Dimitris Zilaskos
                   ` (4 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Dimitris Zilaskos @ 2002-07-04  8:07 UTC (permalink / raw)
  To: lartc

On Wed, 3 Jul 2002, Stef Coene wrote:
> I ran both scripts for 10 minutes (while true; do ./test.sh; sleep 5; done)
> and no freeze for me.
>
> Stef

 I woke up early today to do some more tests . The hang occurs if there is
substantial traffic to the box running the scripts , ie around 300 kb/sec
sustained outgoing traffic . The box serves as ftp server . I could not
freeze it while the ftp daemon was not running (pureftpd) . When  I
started the ftp daemon and traffic began to flow , again running the scripts
7-8 times resulted in a frozen system . I am trying to find out the specific
command that causes the problem....

Regards ,


--
======================================
Dimitris Zilaskos

Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
======================================

_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [LARTC] tc reliably hangs my system
  2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
  2002-07-03 16:47 ` Stef Coene
  2002-07-04  8:07 ` Dimitris Zilaskos
@ 2002-07-04 10:07 ` Dimitris Zilaskos
  2002-07-04 14:42 ` bert hubert
                   ` (3 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Dimitris Zilaskos @ 2002-07-04 10:07 UTC (permalink / raw)
  To: lartc


 ok , this 2 lines repated anything from 5 to 20 times cause the hang :

tc qdisc del dev eth0 ingress
tc qdisc add dev eth0 handle ffff: ingress

 again , the presence of sustained outgoing traffic catalyses the effect .
It takes at least 150-200 kbytes/sec to easily cause the hang .

 Regards ,

--
======================================
Dimitris Zilaskos

Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
======================================
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [LARTC] tc reliably hangs my system
  2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
                   ` (2 preceding siblings ...)
  2002-07-04 10:07 ` Dimitris Zilaskos
@ 2002-07-04 14:42 ` bert hubert
  2002-07-04 18:24 ` bert hubert
                   ` (2 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: bert hubert @ 2002-07-04 14:42 UTC (permalink / raw)
  To: lartc

On Thu, Jul 04, 2002 at 01:07:08PM +0300, Dimitris Zilaskos wrote:
> 
>  ok , this 2 lines repated anything from 5 to 20 times cause the hang :
> 
> tc qdisc del dev eth0 ingress
> tc qdisc add dev eth0 handle ffff: ingress
> 
>  again , the presence of sustained outgoing traffic catalyses the effect .
> It takes at least 150-200 kbytes/sec to easily cause the hang .

I've forwarded this to the right kernel people - your description is
specific enough, so I have good hope that this bug will be spotted soon!

Regards,

bert

-- 
http://www.PowerDNS.com          Versatile DNS Software & Services
http://www.tk                              the dot in .tk
http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [LARTC] tc reliably hangs my system
  2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
                   ` (3 preceding siblings ...)
  2002-07-04 14:42 ` bert hubert
@ 2002-07-04 18:24 ` bert hubert
  2002-07-05 13:35 ` Dimitris Zilaskos
  2002-07-05 14:59 ` bert hubert
  6 siblings, 0 replies; 8+ messages in thread
From: bert hubert @ 2002-07-04 18:24 UTC (permalink / raw)
  To: lartc

On Thu, Jul 04, 2002 at 04:42:19PM +0200, bert hubert wrote:

> I've forwarded this to the right kernel people - your description is
> specific enough, so I have good hope that this bug will be spotted soon!

Ok, I've been told that this might or might not help:

http://www.cyberus.ca/~hadi/patches/ing-stats.patch

This fixes a known issue that looks like this - can you try if this resolves
your problem? This patch will be in in 2.4.19 probably.

Regards,

bert

-- 
http://www.PowerDNS.com          Versatile DNS Software & Services
http://www.tk                              the dot in .tk
http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [LARTC] tc reliably hangs my system
  2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
                   ` (4 preceding siblings ...)
  2002-07-04 18:24 ` bert hubert
@ 2002-07-05 13:35 ` Dimitris Zilaskos
  2002-07-05 14:59 ` bert hubert
  6 siblings, 0 replies; 8+ messages in thread
From: Dimitris Zilaskos @ 2002-07-05 13:35 UTC (permalink / raw)
  To: lartc

>
>
> http://www.cyberus.ca/~hadi/patches/ing-stats.patch
>
> This fixes a known issue that looks like this - can you try if this resolves
> your problem? This patch will be in in 2.4.19 probably.

  Thnx . I am using the patch now with success . I can no longer reproduce
the hang .

  Regards ,

--
======================================
Dimitris Zilaskos

Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
======================================
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [LARTC] tc reliably hangs my system
  2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
                   ` (5 preceding siblings ...)
  2002-07-05 13:35 ` Dimitris Zilaskos
@ 2002-07-05 14:59 ` bert hubert
  6 siblings, 0 replies; 8+ messages in thread
From: bert hubert @ 2002-07-05 14:59 UTC (permalink / raw)
  To: lartc

On Fri, Jul 05, 2002 at 04:35:33PM +0300, Dimitris Zilaskos wrote:
> >
> >
> > http://www.cyberus.ca/~hadi/patches/ing-stats.patch
> >
> > This fixes a known issue that looks like this - can you try if this resolves
> > your problem? This patch will be in in 2.4.19 probably.
> 
>   Thnx . I am using the patch now with success . I can no longer reproduce
> the hang .

Good to hear - I reported the success to the author, Jamal Hadi Salim -
thanks for verifying that it helps!

Regards,

bert

-- 
http://www.PowerDNS.com          Versatile DNS Software & Services
http://www.tk                              the dot in .tk
http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2002-07-05 14:59 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2002-07-03 16:33 [LARTC] tc reliably hangs my system Dimitris Zilaskos
2002-07-03 16:47 ` Stef Coene
2002-07-04  8:07 ` Dimitris Zilaskos
2002-07-04 10:07 ` Dimitris Zilaskos
2002-07-04 14:42 ` bert hubert
2002-07-04 18:24 ` bert hubert
2002-07-05 13:35 ` Dimitris Zilaskos
2002-07-05 14:59 ` bert hubert

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