Re: [PATCH] KVM: x86: Add lowest-priority support for vt-d posted-interrupts

[Paolo Bonzini]

On 25/11/2015 15:12, Radim KrcmÃr wrote:
> I think it's ok to pick any algorithm we like.  It's unlikely that
> software would recognize and take advantage of the hardware algorithm
> without adding a special treatment for KVM.
> (I'd vote for the simple pick-first-APIC lowest priority algorithm ...
>  I don't see much point in complicating lowest priority when it doesn't
>  deliver to lowest priority CPU anyway.)

Vector hashing is an improvement for the common case where all vectors
are set to all CPUs.  Sure you can get an unlucky assignment, but it's
still better than pick-first-APIC.

Paolo
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