Re: [Qemu-devel] Following up questions related to QEMU and I/O Thread

[Paolo Bonzini]

> Thanks Stefan and Paolo for your response and advice!
> 
> Hi Paolo,
> 
> As to the virtio-scsi batch I/O submission feature in QEMU which you
> mentioned, is this feature turned on by default in QEMU 2.9 or there is a
> tunable parameters to turn on/off the feature?

Yes, it is available by default since 2.2.0.  It cannot be turned off, however
it is only possible to batch I/O with aio=native (and, since 2.12.0, with the 
NVMe
backend).

Paolo