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Re: [Xen-devel] Windows SMP

  • To: Venefax <venefax@xxxxxxxxx>
  • From: "Dirk Utterback" <dirk.utterback@xxxxxxxxx>
  • Date: Sun, 28 Dec 2008 22:46:54 -0800
  • Cc: James Harper <james.harper@xxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Sun, 28 Dec 2008 22:47:29 -0800
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  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).


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

-----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

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

Maybe the APIC emulation is causing a performance loss?


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