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

[Okky Hendriansyah]

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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