Messages in this thread | | | Date | Fri, 09 Jan 2015 15:56:00 +0100 | From | Paolo Bonzini <> | Subject | Re: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for VT-d PI |
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On 09/01/2015 15:54, Radim Krčmář wrote: > There are two points relevant to this patch in new KVM's implementation, > ("KVM: x86: amend APIC lowest priority arbitration", > https://lkml.org/lkml/2015/1/9/362) > > 1) lowest priority depends on TPR > 2) there is no need for balancing > > (1) has to be considered with PI as well.
The chipset doesn't support it. :(
> I kept (2) to avoid whining from people building on that behaviour, but > lowest priority backed by PI could be transparent without it. > > Patch below removes the balancing, but I am not sure this is a price we > allowed ourselves to pay ... what are your opinions?
I wouldn't mind, but it requires a lot of benchmarking.
Paolo
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