On Wed, May 18, 2016 at 6:52 PM, Nicolás <nicolas@devels.es> wrote:

Hi,

Probably not an oVirt issue, but maybe someone can help. I've deployed a pretty basic VM (ubuntu 14.04 server, 4GB RAM, 4 CPUs, 15GB storage). Each time I install an additional desktop environment (Gnome, KDE, whatever...), CPU usage rises to 100% all time to the extreme that interacting with the machine becomes impossible (maybe a mouse movement is propagated 3 minutes later or so...).

Is X properly configured with QXL?

xorg-x11-drv-qxl RPM (in Fedora / EL - I assume something similar in Ubuntu) installed, and x.org CONF file properly set up - something like:

Section "Device"
        Identifier              "qxl"
        Driver                  "qxl"
EndSection

Section "Screen"
        Identifier              "screen"
        Device                  "qxl"
        DefaultDepth    24
        SubSection "Display"
                Depth                   24
                Modes                   "1024x768"
        EndSubSection
EndSection

Y.

To debug this, I installed LXDE, which is a lightweight desktop environment based on Xorg. I could see there is an Xorg process consuming one of the CPUs and the machine stops responding as far as the desktop environment goes. I have not changed anything in the configuration file.

I could also see this only happens when QXL is chosen as the display driver. When CIRRUS is chosen, everything works smoothly and CPU is ~100% idle. The downside is that we want to use SPICE and CIRRUS won't allow it.

Why does this happen? Is this an OS-side driver issue? Any hint how can it be fixed?

Thanks.

Nicolás
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