[Qemu-devel] Re: [RFC] Moving the kvm ioapic, pic, and pit back to userspace

[Avi Kivity]

On 06/10/2010 05:37 AM, Dong, Eddie wrote:
> Avi Kivity wrote:
>    
> > On 06/09/2010 06:59 PM, Dong, Eddie wrote:
> >      
> > > Besides VF IO interrupt and timer interrupt introduced performance
> > > overhead risk,
> > >        
> > VF usually uses MSI
> >      
> Typo, I mean PV IO.
>    

That also uses MSI these days.

> A VF interrupt usually happens in 4-8KHZ. How about the virtio?
> I assume virtio will be widely used together w/ leagcy guest with INTx mode.
>    

True, but in time it will be replaced by MSI.

Note without vhost virtio is also in userspace, so there are lots of 
exits anyway for the status register.

--
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