[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] virtio-blk multiqueue support in qemu.
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] virtio-blk multiqueue support in qemu. |
Date: |
Mon, 13 Jul 2015 14:21:44 +0300 |
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
- [Qemu-devel] virtio-blk multiqueue support in qemu., Naredula Janardhana Reddy, 2015/07/01
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Fam Zheng, 2015/07/01
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Michael S. Tsirkin, 2015/07/08
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Stefan Hajnoczi, 2015/07/09
- Message not available
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Michael S. Tsirkin, 2015/07/09
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Naredula Janardhana Reddy, 2015/07/10
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Stefan Hajnoczi, 2015/07/13
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Paolo Bonzini, 2015/07/13
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu.,
Michael S. Tsirkin <=
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Paolo Bonzini, 2015/07/13
- Re: [Qemu-devel] virtio-blk multiqueue support in qemu., Michael S. Tsirkin, 2015/07/13