[libvirt-users] Sluggish performance with virtio and Win10

[Martin Kletzander]

On Thu, Feb 18, 2016 at 10:41:42AM +0100, John Obaterspok wrote:
>2016-02-18 10:13 GMT+01:00 Martin Kletzander <mkletzan at 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?
>>
>>
>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

>-- john
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: Digital signature
URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20160218/d37589b6/attachment.sig>