** Also affects: mutter (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu Noble)
Milestone: None => noble-updates
** Changed in: mutter (Ubuntu Noble)
Status: New => Triaged
** Changed in: mutter (Ubuntu Noble)
Importance: Undecided => High
** Changed in: mutter (Ubuntu)
Milestone: noble-updates => later
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https://bugs.launchpad.net/bugs/2052913
Title:
[Xorg] Large performance regression in fullscreen windows
Status in Mutter:
New
Status in mutter package in Ubuntu:
Triaged
Status in mutter source package in Noble:
Triaged
Bug description:
Test system: ARM64 Ubuntu Jammy (gnome-shell 42.9-0ubuntu2) and Ubuntu Noble
(gnome-shell 45.3-1ubuntu1)
Default Ubuntu GNOME desktop environment used with no user added extensions.
GPU driverstack identical between the two distros (eliminated as a variable).
Linux kernel identical between distros (eliminated as a variable)
CPU, GPU, and RAM clocks pinned to max.
Test case: Minecraft Java Edition (shared drive with identical setup
between Ubuntu versions). Fullscreen 1080p. Xorg display server.
FPS (uncapped):
Ubuntu Jammy: 177fps
Ubuntu Noble: 140fps
Observations:
Ubuntu Jammy:
gnome-shell process cpu% when camera is still: 0-1%
gnome-shell process cpu% when camera is moving: 10-20%
Memory Bandwidth (CPU and GPU shared): 40%
Ubuntu Noble:
gnome-shell process cpu% when camera is still: 20-55%
gnome-shell process cpu% when camera is moving: 30-55%
Memory Bandwidth (CPU and GPU shared): 50%
In both cases GPU utilization is observed to be near 100%.
So in summary, large performance regression regression which appears
to be due to gnome-shell. There is nearly no gnome-shell cpu% usage on
ubuntu jammy when there the camera is still (even with a fps graph
drawn onscreen) in stark contrast to ubuntu noble.
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