[et-mgmt-tools] Xen, Windows 2003 and APIC
Cole Robinson
crobinso at redhat.com
Tue Dec 9 03:01:11 UTC 2008
Gary Pennington wrote:
> Hi,
>
> I've been investigating networking performance for Windows 2003 guests
> on a Solaris dom0 and I've uncovered a couple of things which I don't
> really understand and I'm looking for some explanations.
>
> This first question is really directed at virtinst developers...
>
> Windows guests have different ACPI and APIC settings depending on which
> variant of Windows is to be installed:
>
> variant: unspecified -> ACPI: true, APIC: true
> variant: winxp -> ACPI: false, APIC: false
> variant: win2k -> ACPI: false, APIC: false
> variant: win2k3 -> ACPI: true, APIC: true
> variant: vista -> ACPI: true, APIC: true
>
> The question is: why don't all Windows variants have the same ACPI and APIC
> settings?
>
>
One of the motivations for the ACPI = False, was that when installing
those versions of windows with ACPI enabled, the installer required
manual intervention. The user had to hit F5 or something in a small
time frame and specify a non-default HAL, otherwise the install would
just freeze. Well, that's what I recall anyways. I can't seem to find
a bz about the issue, and the hg history isn't much help.
I have no idea if APIC played a part in the above issue, or why it's
off for winxp or win2000.
Thanks,
Cole
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