https://bugs.kde.org/show_bug.cgi?id=452119
kde....@grau.net changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REPORTED |CONFIRMED
Ever confirmed|0 |1
--- Comment #15 from kde....@grau.net ---
I also noticed a significant slowdown and increased choppiness when switching
from X11 to Wayland.
I ran intel_cpu_info on both desktops and attached the output for idle desktops
and while moving/dragging a chrome browser window around with the mouse. When
run interactively, intel_gpu_top shows values of 1 Mhz and about 220 Mhz for
the idle and moving window szenario on X11, respctively. For Wayland, the
numbers are 5-10 Mhz and about 400 Mhz.
When the output is logged to a file, the numbers look differently for idle
case, though. It looks as if the frequency actually drops a lot more often to
single digit values on wayland in idle, whereas it seems to stay in the 100-200
Mhz range on an idle desktop in X11.
When moving the window around, we see much higher gpu frequencies on Wayland
(around 400Mhz) vs around 250Mhz on X11.
So it seems that wayland requires higher gpu frequencies and while still not
achieving the smooth result of X11.
I did enable the show fps effect, but noticed only a small improvement. I did
notice, however, that dragging a window around with this effect active causes
much higher gpu frequencies (around 700 Mhz).
Please note, that the numbers should only be taken as an indication, as the
tests were conducted using manual input/mouse movements. while other
applications have been running. They do show, however, that wayland currently
puts a much higher burden on this intel GPU.
I don't know much about gfx drives on linux. Is the same driver stack used for
wayland vs X11? Just wondering if the likes of mesa might have an influence on
this, or if this is definitely a kwin-wayland vs kwin-x11 issue.
Please let me know if there is anything else that I can do to provide more
information to help get to the cause of this issue.
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