RE: [Xen-users] Frozen Dom0

To:	"'Luke S Crawford'" <lsc@xxxxxxxxx>
Subject:	RE: [Xen-users] Frozen Dom0
From:	"Venefax" <venefax@xxxxxxxxx>
Date:	Fri, 24 Apr 2009 20:01:58 -0400
Cc:	"'Fajar A. Nugraha'" <fajar@xxxxxxxxx>, 'Xen List' <xen-users@xxxxxxxxxxxxxxxxxxx>
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I had two cores out of 16 dedicated to dom0, and 6GB of RAM out of 128. It
froze solid. I had to recycle the box. It died about 5 mins after the heavy
load started. Is there a simple to setup load simulator that can make me
reproduce it? I cannot call my clients again to send calls (this is a
telephony switch). I would like to capture the console over the network, but
from a PC, since I don't have another linux box available.

-----Original Message-----
From: Luke S Crawford [mailto:lsc@xxxxxxxxx] 
Sent: Friday, April 24, 2009 7:59 PM
To: Venefax
Cc: 'Fajar A. Nugraha'; 'Xen List'
Subject: Re: [Xen-users] Frozen Dom0

"Venefax" <venefax@xxxxxxxxx> writes:

> My machine has Suse 11 and 16 VM's with Red hat 5.3.under heavy load the
> dom0 freezes, and the VM's of course are inaccessible. How do I
troubleshoot
> this? I enabled kdump, but don't know how to trigger a dump, since PRTSCR
> only triggers a screen capture. Is there anything that I can do to find
out
> what is failing? Novell found that I has packet loss, but that does not
make
> a system freeze. How do I capture a memory dump if the machine is frozen?

does it unfreze?  or does it stay frozen?  

if it unfrezes, try this command in the dom0  (I put it in /etc/rc.local
in the dom0)

xm sched-credit -d 0 60000

(you can do the same thing by dedicating a core to the dom0)  

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RE: [Xen-users] Frozen Dom0