Re: [Qemu-devel] virtio-blk multiqueue support in qemu.

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Wed, Jul 08, 2015 at 05:37:12PM +0300, Michael S. Tsirkin wrote:
> On Thu, Jul 02, 2015 at 09:21:21AM +0800, Fam Zheng wrote:
> > On Wed, 07/01 22:45, Naredula Janardhana Reddy wrote:
> > > HI,
> > >      I am trying to improve the throughput of  virtio-blk for my kernel (
> > > https://github.com/naredula-jana/Jiny-Kernel  )  to make use of the
> > > multi-core using multi-queue. But I found the latest qemu  does not support
> > > multiqueue for virtio-blk, The feature flag does not return multi-queue
> > > support. Do we have any patches to the qemu for enabling multi-queue for
> > > virtio-blk similar to that of virtio-net.  Can someone help some pointers
> > > related to this..
> > 
> > There was a series last year adding support for multi-queue but wan't merged to
> > the code base:
> > 
> > http://comments.gmane.org/gmane.comp.emulators.qemu/289126
> > 
> > Fam
> 
> Looks like it was mostly about the missing GPL license on some files.
> Or did I miss some bigger issues?

I think this led to a lot of optimization and some controversial design
questions about bypassing parts of the QEMU block layer.  So I doubt
that this series can be merged without significant changes.

Will take a look at it again though because I'm also interested in
multiqueue block layer support.

Stefan

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