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Re: [libvirt] [PATCH 3/4] domain_conf: Add support for iothreads in disk definition



On Tue, Aug 26, 2014 at 1:38 AM, John Ferlan <jferlan redhat com> wrote:
> +            value. Each device must use a unique IOThread and threads will
> +            be numbered from 1 to the domain iothreads value.

It is reasonable for multiple devices to share the same IOThread.

For example, if you define just 1 IOThread and bind all virtio-blk
devices to it you have a similar setup as the QEMU (no IOThreads) with
the big exception that the QEMU global mutex is not needed for
virtio-blk I/O request processing.  This can already result in a
performance improvement and may make sense where there are many disks
but few host CPUs.

Stefan


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