On 09/07/2015 15:29, Michael S. Tsirkin wrote: > > On the positive side, we do need something similar to the last 3 patches > > to expose multiqueue to the guest. But it will require much more work > > in QEMU to achieve true multiqueue. > > Might this be useful as an intermediate step, e.g. for testing > guest code?
Yes, this is already how virtio-scsi multiqueue is implemented. The speedup is noticeable. However, for virtio-blk there is a huge consumption of interrupt vectors in the guest, so it doesn't scale to multiple disks as well as virtio-scsi.
