[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))

[Vincent Caron <vcaron@xxxxxxxxxxxxx>]

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.


> 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)



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