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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