Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify

Gleb Natapov
2010-11-11T17:55:28Z

On Thu, Nov 11, 2010 at 07:12:40PM +0200, Michael S. Tsirkin wrote:
> On Thu, Nov 11, 2010 at 06:59:29PM +0200, Avi Kivity wrote:
> > On 11/11/2010 03:47 PM, Stefan Hajnoczi wrote:
> > >Some virtio devices are known to have guest drivers which expect a notify to be
> > >processed synchronously and spin waiting for completion. Only enable ioeventfd
> > >for virtio-blk and virtio-net for now.
> >
> > Which drivers are these?
> >
> > I only know of the virtio-gl driver, which isn't upstream.
>
> I think that PXE virtio drivers do polling. But I think this change does
> not break these drivers. It'll probably make them a bit slower. Right,
> Gleb?
>
Can't tell about PXE virtio drivers, but virtio-blk in seabios does
polling.

--
Gleb.