https://bugs.kde.org/show_bug.cgi?id=525008
Bug ID: 525008
Summary: Kwin main thread hangs on
EglGbmLayerSurface::importBuffer and
GLTexturePrivate::~GLTexturePrivate when GPU is busy.
Classification: Plasma
Product: kwin
Version First 6.7.4
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Keywords: wayland-only
Severity: normal
Priority: NOR
Component: performance
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Flags: NVIDIA+
When the GPU is busy, I observe severe Kwin hitches on the cursor and the
capslock/numlock LED because the main thread is blocked in
EglGbmLayerSurface::importBuffer and GLTexturePrivate::~GLTexturePrivate
respectively.
STEPS TO REPRODUCE
1. Open a browser with WebGL enabled and go to
https://threejs.org/examples/webgl_renderer_pathtracer.html (Warning: this page
highly loads the GPU and may hangs some GPU drivers)
2. Wait until GPU usage is maxing out.
3. Move the cursor, open some windows or do any other interaction with Kwin.
OBSERVED RESULT
Severe cursor and capslock/numlock LED hitches because Kwin main thread is
blocked in EglGbmLayerSurface::importBuffer and
GLTexturePrivate::~GLTexturePrivate.
EXPECTED RESULT
The main thread should no be blocked on buffer import and texture destruction.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.2
Linux: 7.1.11-arch1-1
Nvidia: 610.57.04
ADDITIONAL INFORMATION
GLTexturePrivate::~GLTexturePrivate is calling glDeleteTextures. Even if this
function should be non-blocking, with Nvidia drivers this function is blocking.
I also shared as attachment a performance capture of my system while this issue
occurred with Sysprof.
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