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[Xen-devel] Re: PVops domain 0 crash on NUMA system only Node==1 present

To: Vincent Caron <vcaron@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: PVops domain 0 crash on NUMA system only Node==1 present (Was: Re: Bug#603632: linux-image-2.6.32-5-xen-amd64: Linux kernel 2.6.32/xen/amd64 booting fine on bare metal, but not as dom0 with Xen 4.0.1 (Dell R410))
From: Ian Campbell <ijc@xxxxxxxxxxxxxx>
Date: Thu, 25 Nov 2010 14:44:42 +0000
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Vincent CARON <zerodeux@xxxxxxxxxxxx>, Daniluk <cris.daniluk@xxxxxxxxx>, 603632@xxxxxxxxxxxxxxx, Cris
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On Thu, 2010-11-25 at 14:29 +0100, Vincent Caron wrote:
> On Tue, 2010-11-23 at 11:51 +0000, Ian Campbell wrote:
> >
> > One thing I notice when googling R410 issues is that they apparently
> > have a "Cores per CPU" BIOS option which might be worth playing with,
> > since configuring a reduced number of cores might remove node 0 but not
> > node 1 (odd but not invalid?). Presumably it is also worth making sure
> > you have the latest BIOS etc.
>   Indeed, I tweaked one BIOS setting, I disabled hyperthreading.
>   The R410 BIOS has a CPU menu with (among other options):
>   - Logical Processor: this is 'HT', default is enabled, I have disabled
> it.
>   - Virtualization Technology: default is disabled. Kept disabled.
>   - Number of Cores per Processor: default is 'All'. Options are
> single/dual/all. Kept 'all' defalut.
>   I just tried to boot Xen 4.0 hypervisor after reverting to the factory
> default 'HT enabled' (aka Logical Processor: Yes), same bug.
>   Then I swithed off HT again, and enabled 'Virtualization
> Technology' (setting which I totally overlooked, but why is it disabled
> as default ?). Same bug.

Oh well, thanks for trying it!

> > It's very much an outside possibility but it is also worth trying the
> > packages at http://xenbits.xen.org/people/ianc/ which reinstates the
> > changesets from bcf16b6b4f34fb40a7aaf637947c7d3bce0be671
>   OK, should I pick the one in
> http://xenbits.xen.org/people/ianc/squeeze/ ? (I'm running Debian
> Squeeze on this machine)

Yes but that's a bit of a long shot (those packages only put back some
GPU related fixes.

It would be more useful to test the packages at


Ian Campbell
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