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RE: [Xen-devel] Windows SMP
| To: | "'James Harper'" <james.harper@xxxxxxxxxxxxxxxx>, "'Dirk Utterback'" <dirk.utterback@xxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] Windows SMP |
| From: | "Venefax" <venefax@xxxxxxxxx> |
| Date: | Sun, 28 Dec 2008 21:59:44 -0500 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Sun, 28 Dec 2008 19:01:28 -0800 |
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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 |
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