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RE: [Xen-devel] Windows SMP

To: "Venefax" <venefax@xxxxxxxxx>, "Dirk Utterback" <dirk.utterback@xxxxxxxxx>
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Mon, 29 Dec 2008 13:53:15 +1100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Sun, 28 Dec 2008 18:53:47 -0800
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
Thread-index: AclpXq3FDdh9/hRMR7SA68V92eNifgAAPoJwAAAyQsA=
Thread-topic: [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


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