On Thu, May 20, 2021 at 03:13:05PM +0100, Stefan Hajnoczi wrote: > Possible drawbacks of this approach: > > - Hardware virtio_blk implementations may find virtqueue_disable_cb() > expensive since it requires DMA. If such devices become popular then > the virtio_blk driver could use a similar approach to NVMe when > VIRTIO_F_ACCESS_PLATFORM is detected in the future. > > - If a blk_poll() thread is descheduled it not only hurts polling > performance but also delays completion of non-REQ_HIPRI requests on > that virtqueue since vq notifications are disabled. Yes, I think this is a dangerous configuration. What argument exists again just using dedicated poll queues?
