Re: [libvirt-users] Sluggish performance with virtio and Win10

2016-02-18 15:15 GMT+01:00 Martin Kletzander <mkletzan(a)redhat.com&gt;: > On Thu, Feb 18, 2016 at 12:59:52PM +0100, John Obaterspok wrote: > >> 2016-02-18 11:25 GMT+01:00 Martin Kletzander <mkletzan(a)redhat.com&gt;: >> >> On Thu, Feb 18, 2016 at 10:41:42AM +0100, John Obaterspok wrote: >>> >>> 2016-02-18 10:13 GMT+01:00 Martin Kletzander <mkletzan(a)redhat.com&gt;: >>>> >>>> On Thu, Feb 18, 2016 at 08:49:38AM +0100, John Obaterspok wrote: >>>> >>>>> >>>>> Hello, >>>>> >>>>>> >>>>>> I'm using virt-manager on my F23 box to run a Windows 10 image but the >>>>>> performance is so bad it's killing me. >>>>>> >>>>>> I have "vmx" flag in /proc/cpuinfo >>>>>> >>>>>> # lsmod |grep kvm >>>>>> kvm_intel 167936 6 >>>>>> kvm 503808 1 kvm_intel >>>>>> >>>>>> virtio-win-0.1.112-1.noarch >>>>>> >>>>>> But no virtio modules loaded. Should they be loaded nowadays? >>>>>> >>>>>> >>>>>> Not on the host AFAIK. >>>>> >>>>> The disk format used is vmdk with no caching and native mode. >>>>> >>>>> The io is 100% in windows task manager performing less than 1MB/s >>>>>> >>>>>> Any clues? >>>>>> >>>>>> >>>>>> What are the figures from the host? What is qemu doing and what are >>>>>> the >>>>>> >>>>> other processes and devices doing? >>>>> >>>>> >>>>> What is the best way to find this out? >>>>> >>>> >>>> >>>> {,a,h}top should do for the initial runs, just to see if the block layer >>> is busy or the CPU is busy or something else is blocking it >>> >>> >>> atop seems to indicate that sdd is busy? >> >> DSK | sdd | busy 96% | | read 1455 | write >> 1319 | KiB/r 5 | KiB/w 9 | | MBr/s 0.74 | MBw/s >> 1.26 | avq 1.01 | | avio 3.43 ms | >> >> # mount | grep sdd >> /dev/sdd2 on /vm type ext4 (rw,relatime,seclabel,data=ordered) >> >> > And it doesn't do that in any other process on the host? It looks like > it's not related to virtualisation... > > Hi, I changed from vmdk to raw and the Write performance went from 1.6 MB/s to ~100 MB/s

Is vmdk write performance so bad?

Result: http://postimg.org/image/gcqe5affn/