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Re: [Qemu-devel] Following up questions related to QEMU and I/O Thread
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] Following up questions related to QEMU and I/O Thread |
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Date: |
Tue, 5 Mar 2019 17:29:05 +0000 |
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User-agent: |
Mutt/1.11.3 (2019-02-01) |
On Mon, Mar 04, 2019 at 09:33:26AM -0800, Wei Li wrote:
> While @Stefan mentioned about additional iothread object support of
> virtio-blk, Is the feature also supported by virtio-scsi? I am trying to
> exploring the perf multiple IO threads / per VM via followings:
> QMP setup example to create 2 io threads in QEMU, one io thread per device:
>
> (QEMU) object-add qom-type=iothread id=iothread0
>
> (QEMU) object-add qom-type=iothread id=iothread1
>
>
>
> (QEMU) device_add driver=virtio-scsi-pci id=test0 iothread=iothread0
>
> (QEMU) device_add driver=virtio-scsi-pci id=test1 iothread=iothread1
>
>
>
> (QEMU) device_add driver=scsi-block drive=none0 id=v0 bus=test0.0
>
> (QEMU) device_add driver=scsi-block drive=none1 id=v1 bus=test1.0
Yes, each virtio-scsi-pci device can be assigned to an iothread.
> You mentioned about the multi-queue devices feature, it seems like the
> multi-queue feature will help improve the IOPS of single Device. Could you
> please provide more details?
> What’s the current plan of support multi-queue device? Which release will
> include the support or it has already been included in any existing release
> newer than 2.9?
> Is there any feature branch which I would get more details about the code and
> in progress status?
I have CCed Paolo, who has worked on multiqueue block layer support in
QEMU. This feature is not yet complete.
The virtio-scsi device also supports multiqueue, but the QEMU block
layer will still be a single queue.
Stefan
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