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Intel <=> AMDIntel <=> AMDPosted Mar 3, 2007 9:36 UTC (Sat) by addw (guest, #1771)Parent article: KVM 15
''guest systems can be moved between Intel and AMD processors with no problems at all.''
What about those programs that use different instructions depending on the CPU ? These generally detect the CPU type when they start, but after a migration they will fail - since they don't redetect again.
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Intel <=> AMD Posted Mar 4, 2007 6:04 UTC (Sun) by avik (guest, #704) [Link] Programs detect cpu capabilities by means of the cpuid instruction. Sincethat instruction is itself virtualized and controlled by the host userspace, one can tell virtualize a processor with the least capabilities that are in use on the server farm. Gievn that, programs will only use instructions that are present on all processors that can be a migration target.
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