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Re: [virt-tools-list] Windows XP 32 guest - i686 or x86_64



On Tue, Sep 21, 2010 at 09:38:34AM +0100, Daniel P. Berrange wrote:
> On Tue, Sep 21, 2010 at 06:06:54PM +1000, Justin Clift wrote:
> > On 09/20/2010 05:22 PM, Grant Williamson wrote:
> > >Hi,
> > >if I install a 32 bit Windows XP Guest using virt-manager, the default
> > >arch is set to x86_64.
> > >Is there any advantage using x86_64 or should I switch to i686?.
> > >Or does it make no difference.
> > 
> > Hi Grant,
> > 
> > If you switch the vm to 32-bit mode, it will use the qemu emulator 
> > without hardware acceleration.
> 
> It shouldn't do that. It should just be using KVM with a 32-bit
> CPU model specified. Much older libvirt used to drop back to QEMU
> in this case, but we fixed that.

Changing the CPU model just changes CPUID?  Or does it actually
disable parts of the emulation?

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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