Andi Kleen wrote:
> Migration is fundamentally incompatible with many CPU optimizations.
> But that's not a reason to not optimize anymore.
>
I've been thinking about ways in which Xen could provide the current
vcpu->cpu map to guest domains. Obviously this would change over time,
but it could remain current enough to be useful.
> But I guess luckily most migration users will be able to live
> with a little decreased performance after it.
>
At least in the Xen case, the source and target machines need to be
fairly similar in architecture (can't deal with vastly different CPU
types, for example).
J
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