On Mon, Jul 13, 2015 at 12:17:43PM +0200, Paolo Bonzini wrote: > > > 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.
Could you elaborate please? interrupt vector usage is generally up to the guest, so whatever the issue is might be fixable by driver changes alone. -- MST
