RE: [Xen-devel] Windows SMP

["Venefax" <venefax@xxxxxxxxx>]

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


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