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Re: [Qemu-devel] Lock contention in QEMU


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] Lock contention in QEMU
Date: Fri, 16 Dec 2016 09:48:50 +0000
User-agent: Mutt/1.7.1 (2016-10-04)

On Thu, Dec 15, 2016 at 11:04:23AM -0500, Weiwei Jia wrote:
> On Thu, Dec 15, 2016 at 3:06 AM, Stefan Hajnoczi <address@hidden> wrote:
> > On Thu, Dec 15, 2016 at 12:17:09AM -0500, Weiwei Jia wrote:
> >> BTW, do we have an example to show users how to config following
> >> virtio-blk dataplane commands into XML configuration file?
> >>
> >> qemu -object iothread,id=iothread0 \
> >>       -drive if=none,id=drive0,file=test.img,format=raw,cache=none \
> >>       -device virtio-blk-pci,iothread=iothread0,drive=drive0
> >
> > https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation
> >
> > See also <cputune><iothreadpin> and <driver iothread=>.
> 
> It seems that the libvirt XML configuration in above link [1] is
> different from the configuration which you said in your blog [2]. Your
> blog just said how to use x-data-plane for virtio-blk but libvirt XML
> configuration doesn't say anything about x-data-plane. Does it in
> default support by latest QEMU version. If I want to test virtio-blk
> or virtio-scsi data-plane to make timeslice more stable, what version
> of QEMU/KVM should I use? Would you please give me some suggestions?
> Thank you.
> 
> [1] https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation
> [2] 
> http://blog.vmsplice.net/2013/03/new-in-qemu-14-high-performance-virtio.html

I will update the blog post (from 2013) with the modern libvirt XML
syntax.

Please use the
https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation
documentation (unless you are using a really old QEMU and libvirt!).

Stefan

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