Re: [PATCH vfio 11/11] vfio/virtio: Introduce a vfio driver over virtio devices

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On Thu, Sep 21, 2023 at 05:09:04PM +0000, Parav Pandit wrote:
> > From: Michael S. Tsirkin <mst@xxxxxxxxxx>
> > Sent: Thursday, September 21, 2023 10:31 PM
> > Another question I'm interested in is whether there's actually a performance
> > benefit to using this as compared to just software vhost. I note there's a VM exit
> > on each IO access, so ... perhaps?
> > Would be nice to see some numbers.
> Packet rate and bandwidth are close are only 10% lower than modern device due to the batching of driver notification.
> Bw tested with iperf with one and multiple queues. 
> Packet rate tested with testpmd.

Nice, good to know.  Could you compare this with vdpa with shadow vq
enabled?  That's probably the closest equivalent that needs
no kernel or hardware work.


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