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Re: [Xen-users] Re: PV 32-in-64 ? Howto ?

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Peter Peltonen" <peter.peltonen@xxxxxxxxx>
  • Date: Wed, 1 Aug 2007 09:42:19 +0300
  • Delivery-date: Tue, 31 Jul 2007 23:40:05 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

On 7/31/07, Stephan Seitz <nur-ab-sal@xxxxxx> wrote:
> Well, I *have* a 64 bit dom0 with a 32 bit PV guest running. But the
> kernel is a 64 bit kernel. But since a 64 bit kernel can run 32 bit
> applications (if the configure options are set), there is no problem.
> I installed a 32 bit base system (debootstrap --arch i386 etch <target>)
> as a DomU, compiled a 64 bit kernel in the 64 bit Dom0 (with 32 bit
> support) and everything works fine.

How does that compare to 32bit full virtualized domU running under
64bit dom0? There must be some perfomance loss because of the 32bit
emulation with 64bit kernel...

I cannot make my 32bit centos5 dom0 kernel to see all memory in my
machine for some reason, so I'm thinking all these other options as I
need a 32bit domU. Your option seems interesting as I would not have
to ditch the centos rpm packaged xen. Do you know if the redhat/centos
xen kernel has 32bit emulation enabled?


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