Re: PCI passthrough with VT-d - native performance

[Avi Kivity <avi@qumranet.com>]

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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