Hi Kashyap, Here I want to test and see how much I/O performance could be improved by virtio-blk data plane feature. Yes, this is a dirty way to enable it :-), You mentioned using newer libvirt, is there parameter similar "x-data-plane=on" in new version libvirt? Please let know me you if you have better solution.
Regards, CY. On Mon, Apr 20, 2015 at 10:51 PM, Kashyap Chamarthy <kcham...@redhat.com> wrote: > On Mon, Apr 20, 2015 at 10:37:13PM +0800, Chengyuan Li wrote: > > Hi, > > > > I tried to enable virtio-blk data plane feature for VMs in my openstack > > environment, the hypervisor is ubuntu 14.04, libvirt 1.2.2 > > [I haven't tested the virtio-blk data plane myself.] > > This libvirt version seems a little old (from March 2014), you might > want to move to a bit newer. > > > and QEMU 2.0. > > As nova doesn't support that parameter yet, I did belows > > > > 1. nova boot a VM with raw disk image. > > 2. nova stop the VM. > > 3. run "virsh edit <instance-id>" on the hyprvisor node, and adding below > > into instance xml just before </domain>. > > You're modifying the guest definition behind Nova's back, so you get to > keep all the pieces if something breaks. :-) > > > However, the <qemu:commandline> part is ignored and not saved after > closing > > virsh edit, seems that libvirt rejected these changes. Is there any XML > > syntax error here? Or libvirt doesn't support <qemu:commandline> tag? > > > > <qemu:commandline> > > <qemu:arg value='-set'/> > > <qemu:arg value='device.drive-virtio-disk0.x-data-plane=on'/> > > </qemu:commandline> > > > -- > /kashyap >
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