[vfio-users] cpu usage in guest != cpu usage in host, even with exclusive pinning

[Jayme Howard]

I haven't used exclusive pinning on 4.5.0, but my CPU on my host for qemu
never goes below 90% on the main PID, even when the my Win 10 guest is 100%
idle.  That might not be in the spirit of this thread, though.

On Sun, Apr 3, 2016 at 7:52 PM, Brandon Ganem <brandonganem at gmail.com>
wrote:

> Anyone try 4.5 to see if it resolves this issue?
>
> On Tue, Mar 22, 2016 at 10:52 PM, Brandon Ganem <brandonganem at gmail.com>
> wrote:
>
>> I see this on my end, ubuntu 16.04 beta. Also using CPU pinning.
>> Sitting in windows 10 with a web browser is enough.
>>
>>
>> Linux 4.4.0-15-generic #31-Ubuntu SMP Fri Mar 18 19:08:31 UTC 2016 x86_64
>> x86_64 x86_64 GNU/Linux
>> qemu: https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu6
>>
>> Thanks.
>>
>>
>> On Tue, Mar 22, 2016 at 6:56 AM, Okky Hendriansyah <okky.htf at gmail.com>
>> wrote:
>>
>>> On Tue, Mar 22, 2016 at 12:12 AM, Jon Panozzo <jonp at lime-technology.com>
>>> wrote:
>>>
>>>> Can confirm 4.2.8 kernel doesn’t exhibit this behavior with the same
>>>> QEMU package and VM guest.  So taking the exact same software configuration
>>>> to the 4.2.8 kernel results in normal CPU usage, but with any 4.4.x kernel
>>>> variant I’ve tried thus far, I’ve seen the same 100% usage.
>>>>
>>>> It seems to apply when any media application is in use (3D, audio, or
>>>> video).  Just playing an MP3 for me caused the host to go to 100%.  And if
>>>> I leave shadowplay running, it stays at 100% as well.  Any application that
>>>> pulls on a VFIO passed-through device seems to cause this to occur for me.
>>>
>>>
>>> Finally someone else beside me that experienced this kind of behavior.
>>> At first I thought it was only on the demanding games. But when I also
>>> noticed that also whenever I play music on my audio player the host CPU
>>> went 100% on all cores. Although it didn't really affect the game
>>> performance, but seeing the CPU load like that made me step back for the
>>> time being to kernel 4.1.x
>>>
>>> Best regards,
>>> Okky Hendriansyah
>>>
>>>
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>>> vfio-users at redhat.com
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>>>
>>>
>>
>
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