https://bugs.freedesktop.org/show_bug.cgi?id=104598
Michel Dänzer <mic...@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|DRM/AMDgpu |DRM/other
--- Comment #7 from Michel Dänzer <mic...@daenzer.net> ---
Thanks, I was finally able to reproduce this. Seems like it's only reproducible
if the app runs at >= ~10K FPS.
It happens because the client submits so many PresentPixmap requests within a
single vertical blank period that the corresponding DRM vblank events fill up
the kernel DRM event queue. Then when the compositor sends a PresentPixmap
request, the page flip ioctl gets -ENOMEM from drm_event_reserve_init and
propagates it. (That the modesetting driver can't deal with this is its bug)
Options for addressing this:
The kernel might allow queuing page flip events even when the queue is full
with vblank events.
The xserver present code should be able to re-use a single DRM vblank event for
multiple client requests with the same target MSC.
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