Re: [Qemu-devel] Following up questions related to QEMU and I/O Thread

[Paolo Bonzini]

On 29/04/19 15:40, Stefan Hajnoczi wrote:
> This isn't fully effective since the guest driver kicks once per
> request.  Therefore QEMU-level batching you mentioned only works if QEMU
> is slower at handling virtqueue kicks than the guest is at submitting
> requests.
> 
> I wonder if this is something that can be improved.

Right, virtscsi_kick_cmd does limit notifications but not submissions.
The SCSI layer does not have separate queue_rq and commit_rqs callbacks.
 That should not be too hard to fix though.

Paolo

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