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Re: [Xen-devel] Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupools.
- To: Pasi Kärkkäinen <pasik@xxxxxx>
- From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
- Date: Thu, 21 Jul 2011 15:15:34 +0200
- Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx, andrewpitman@xxxxxxxxxxx
- Delivery-date: Thu, 21 Jul 2011 06:16:06 -0700
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On 07/21/11 14:58, Pasi Kärkkäinen wrote:
On Fri, Jul 15, 2011 at 02:30:09PM +0000, andrewpitman@xxxxxxxxxxx wrote:
Hi all!
I've been trying to make use of the credit2 scheduler for my guests
running real-time (audio) applications, and to facilitate this I'm using
cpupools to separate Domain-0 and less time critical guests which run fine
under the regular credit scheduler, and the others which need to use
credit2. However, I seem to be able to reliably crash the hypervisor when
I try to move virtual cpus (hyperthreads) or domains between cpupools.
Sometimes it even crashes when I simply try to set the credit2 scheduler
weight for a domain. All domains are fully virtualized and running CentOS
5. Dom-0 is running Fedora 13 with pvops 2.6.32.40 kernel.
The panic message displays a register dump and stack trace, as well as:
(XEN) Panic on CPU 0:
(XEN) Xen BUG at sched_credit.c:991
Hardware is a Dell R810 server with one 10-core Xeon E7, 128 GB RAM and
the guests reside on NAS storage.
If I simply use Pool-0 for everything and set the default scheduler to
credit2 in the Xen boot string everything runs fine, but this workaround
is not ideal since it removes some flexibility for me.
Any ideas where I should look to determine how to resolve this?
You could try to make credit2 cpupool-ready ;-)
I don't think credit2 is supporting cpupools up to now (at least not any other
cpupool than Pool-0). George?
I wanted to address this topic on the upcoming Xen Hackathon here in Munich, as
George will be here, too, to answer my questions...
Hope you can wait until then...
As I'm very busy now, I won't have much time to look into this earlier.
Juergen
--
Juergen Gross Principal Developer Operating Systems
PDG ES&S SWE OS6 Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions e-mail: juergen.gross@xxxxxxxxxxxxxx
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