[Qemu-devel] Re: [PATCH] virtio: Use ioeventfd for virtqueue notify

[Anthony Liguori]

On 10/03/2010 09:28 AM, Michael S. Tsirkin wrote:
> > This is using eventfd as well.
> >      
> Sorry, I meant irqfd.
>    

I've tried using irqfd in userspace.  It hurts performance quite a bit 
compared to doing an ioctl so I would suspect this too.

A last_used_idx or similar mechanism should help performance quite a bit 
on top of ioeventfd too.

Regards,

Anthony Liguori

> > --
> > error compiling committee.c: too many arguments to function
> >