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

[Brandon Ganem]

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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>>
>
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