Re: PCI passthrough with VT-d - native performance

Avi Kivity
2008-07-16T16:57:09Z

Ben-Ami Yassour wrote:
>
>> That CPU utilization is extremely high and somewhat illogical if native
>> w/vt-d has almost no CPU impact. Have you run oprofile yet or have any
>> insight into where CPU is being burnt?
>>
>> What does kvm_stat look like? I wonder if there are a large number of
>> PIO exits. What does the interrupt count look like on native vs. KVM
>> with VT-d?
>>
>> Regards,
>>
>> Anthony Liguori
>>
>>
>
> These are all good points and questions, I agree that we need to take a deeper
> look into the performance issues, but I think that we need to merge with
> the main KVM tree first.
>

It would be good to get the host interrupt rate, to confirm that the
host isn't flooded with interrupts. A deeper analysis can wait.

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