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

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...