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Date: Thu, 11 Nov 2010 19:55:08 +0200
From: Gleb Natapov <gleb@redhat.com>
Message-ID: <20101111175508.GG6798@redhat.com>
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Subject: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for
	virtqueue notify
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel@nongnu.org, Avi Kivity <avi@redhat.com>, kvm@vger.kernel.org, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

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.