Re: [Xen-devel] Windows SMP

["Dirk Utterback" <dirk.utterback@xxxxxxxxx>]

  What is your Xen and Windows version?  I have been using CentOS5, and Windows XP as the guest.
It works fine with 2 vcpu for Windows in my setup(apic=1, acpi=1).

Dirk

On Sun, Dec 28, 2008 at 6:59 PM, Venefax <venefax@xxxxxxxxx> wrote:

I had to disable both, and PAE. Only APIC=0 would not make any difference. I
will some further testing with Citrix Xenserver 5, using the same virtual
machine and another copy with their vmpd drivers. I bet that there is no
difference in performance. It seems to be a Xen architectural issue. Any
ideas?

-----Original Message-----
From: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx]
Sent: Sunday, December 28, 2008 9:53 PM
To: Venefax; Dirk Utterback
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx

Subject: RE: [Xen-devel] Windows SMP

>
> The problem is not SMP, is ACPI. I installed a non-ACPI Hal, but SMP
> capable, and the performance went right up with 4 virtual processors.
>
> I hope the developers can look into this mess.
>

Can you have ACPI enabled but APIC disabled, or is that not a valid
configuration?

Or the other way around, can you have ACPI disabled but APIC enabled?

Maybe the APIC emulation is causing a performance loss?

James

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel