[Bug 84663] high cpu usage, poor performance in Borderlands 2 with radeonsi, PRIME

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=84663

--- Comment #9 from Christoph Haag <haagch@frickel.club> ---
I wish I had an idea what causes this. I think this is a general problem, but I
can't put my finger on it.

Yesterday at home I tried the oculus rift unity3d demo with -force-opengl in
wine and got pretty much 75fps everywhere. Today at uni it drops to 45 fps when
looking at the more complex objects in the demo. Then CPU usage is at ~113% and
the GPU usage is relatively low.

Something from disconnecting audio jacks, dvi monitor, usb hub with keyboard,
mouse and usb DAC, suspending, waking up on battery, suspending again, waking
up on power must have caused the state where it's performing badly.

Trying with dri2 instead of dri3, setting vblank_mode=0, switching to another
window manager, restarting X, connecting another dvi monitor, setting the
display to another crtc, nothing seems to have any effect. I think at one point
I disabled intel pstate cpu scaling and this didn't help either...

The state where it's performing well happens rarely, but it seems that it
randomly does happen. The next time I'll make sure to test borderlands 2 too to
confirm whether there is some underlying problem and collect some profiling
data...

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