https://bugs.kde.org/show_bug.cgi?id=467574
Paulo Marcos <contato-mygh...@protonmail.com> changed:
What |Removed |Added
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CC| |contato-myghi63@protonmail.
| |com
--- Comment #10 from Paulo Marcos <contato-mygh...@protonmail.com> ---
THE PROBLEM:
Recording the screen via OBS + Vaapi is pretty smooth even at 144fps here, but
the main problem (flood from kwin_screencast) is even worse, because if I use
my monitor at 144hz, kwin_wayland starts using 100% of a single core and keeps
flooding for more than ~200 messages PER SECOND, by just launching OBS or
sharing screen on any app.
I also tried increasing rtkit priority of pipewire proccess on it's settings
(pipewire.conf), but the problem still happens.
POSSIBLE ROOT OF THE ISSUE:
So I noticed a possible cause of this problem by looking at a patch from
PortageStuff (URL at the bottom of this comment).
First of all, m_pendingBuffer is being set to true very frequently for some
reason (pipewire fault?), so for every single dropped frame, the if statement
is executing the qCWarning comamnd, which can both stress a CPU core and cause
all the flooding.
SUGGESTED WORKAROUND/FIX:
If possible, for every second doing the screencast, track how much frames has
been dropped and compare it to the target FPS. If more than 60% of the frames
are being dropped, then finally send the kwin_screencast warning, because in
this specific case the screencast performance is significantly worse than it
should!
SOFTWARE/OS VERSIONS AND HARDWARE:
Operating System: Arch Linux (Updated at 8 June, 2023)
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.6-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Pipewire: 1:0.3.71-2
Wireplumber: 0.4.14-1
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 31,3 GiB de RAM
Graphics Processor: AMD Radeon RX 5500 XT
PortageStuff's patch:
https://github.com/FireBurn/PortageStuff/blob/53f540ce02d32c1e8e9f13f23e0fcd3b9205e96b/patches/kde-plasma/kwin/spam.patch#L9
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