Messages in this thread | | | Date | Thu, 23 Jul 2009 12:34:40 +0200 | From | Andre Przywara <> | Subject | Re: This combination of AMDprocessors is not suitable for SMP? |
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Michael Tokarev wrote: > (yes there's no typo in $subject, it's an old formatting > bug in printk). > > When booting kvm guest on an AMD CPU, guest kernel prints > this warning: > > WARNING: This combination of AMDprocessors is not suitable for SMP. > > be it SMP or UP guest. What's wrong with this "combination", > and can it be fixed? The qemu64 CPU model KVM injects into the guest lets it see an AMD K7 with 64bit extension. Only some AMD K7 (Athlon-MP) were certified for SMP support, so this code warns the user about an unsupported hardware. When running KVM you can ignore this warning, as it only applies to non-KVM capable processors and has no meaning for virtual SMP anyway.
If you like this warning to disappear, you can use "-cpu host" (and probably loose migration capability) or wait for the new safe64 CPU type, which will use family 15 instead of 6.
Regards, Andre.
-- Andre Przywara AMD-Operating System Research Center (OSRC), Dresden, Germany Tel: +49 351 448 3567 12 ----to satisfy European Law for business letters: Advanced Micro Devices GmbH Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen Geschaeftsfuehrer: Thomas M. McCoy; Giuliano Meroni Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen Registergericht Muenchen, HRB Nr. 43632
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