https://bugs.freedesktop.org/show_bug.cgi?id=106736
--- Comment #8 from Daniel Stone <[email protected]> ---
(In reply to Eero Tamminen from comment #7)
> I wasn't able to reproduce the problem with simple-egl test, e.g. with:
> weston-simple-egl -b -o -u 15000
>
> But that doesn't seem to use *SwapBuffers().
>
> I'm not sure whether SwapBuffers() is the only reason why it doesn't trigger
> the issue. Maybe the test-case actually need to also fully use GPU, for
> this issue to be visible.
It certainly does call eglSwapBuffers:
https://gitlab.freedesktop.org/wayland/weston/blob/master/clients/simple-egl.c#L568
> Just increase the window size W & H parameters until reported FPS is
> somewhere between 70-100 FPS.
So presumably it's running with eglSwapInterval(0) which doesn't block on frame
callbacks at all?
> -> I assume in that particular case, compositor would also require higher
> GPU priority than the test. Setting priorities is fairly new Mesa (and i915
> kernel module) feature.
We do use it:
https://gitlab.freedesktop.org/wayland/weston/commit/b678befb6ed055e6c66466505d9195a3cebf8073
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