https://bugs.kde.org/show_bug.cgi?id=384402
Bug ID: 384402
Summary: KWin compositing performance anomaly
Product: kwin
Version: 5.8.7
Platform: openSUSE RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: network...@rkmail.ru
Target Milestone: ---
Flags: Wayland?, X11+
I'm experiencing strange performance issues when using KWin + Desktop Effects +
VSync (suspending of desktop effects is disabled). I'm not sure how to describe
it correctly, but sometimes it looks like the framerate is really low (around
20fps), despite that various framerate counters may show 160+ fps. The worst
thing about it, I cannot reliably reproduce it, most of time the picture is
nice and smooth, but sometimes the "visual" framerate would drop for a few
seconds and then restore. Switching window focus usually restores the
performance. I've also noticed it's somehow related to system's uptime, the
longer it runs, the higher is chance to hit the problem. But it's not
necessary, sometimes it starts just after boot.
It's very annoying, especially if you're playing video games, or watching 60fps
videos.
There is no framerate drops if I disable VSync, enable desktop effects
suppression, or use another window manager, so my guess it that frames get
dropped somewhere in the composition pipeline.
Hardware: AMD RX480 with amdgpu X driver & Mesa
OS: openSUSE 42.3 with Plasma 5.8
Currently, I have Mesa-git, but the problem is also reproducible with Mesa 17.1
I'd like to provide more information, but I don't know what you may need.
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