2016-02-18 10:13 GMT+01:00 Martin Kletzander <mkletzan@redhat.com>:

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?