designated_writer_98
n00b
Joined: 19 Sep 2024
Posts: 1
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 Posted: Thu Sep 19, 2024 9:14 pm Post subject: kwin_wayland high CPU usage after kernel upgrade (Nvidia) |
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Hi all,
I've had this problem every time I upgraded the kernel. After rebooting the new kernel, Plasma would be very sluggish and kwin_wayland would use about 100% CPU. I could usually fix that by recreating my initrd to ensure all required Nvidia modules are loaded, and then rebooting.
This time (EDIT: kernel 6.10.11-gentoo-dist), however, that didn't help. I also tried rebuilding the nvidia-driver package, to no avail. The nvidia module options and the kernel command line are OK, journalctl shows that the correct module and the correct firmware were loaded successfully:
| Code: | Sep 19 23:02:20 gentoo kernel: nvidia-nvlink: Nvlink Core is being initialized, major device number 235
Sep 19 23:02:20 gentoo kernel:
Sep 19 23:02:20 gentoo kernel: nvidia 0000:0a:00.0: vgaarb: VGA decodes changed: olddecodes=io+mem,decodes=none:owns=none
Sep 19 23:02:20 gentoo kernel: hub 5-4:1.0: USB hub found
Sep 19 23:02:20 gentoo kernel: hub 5-4:1.0: 4 ports detected
Sep 19 23:02:20 gentoo kernel: NVRM: loading NVIDIA UNIX Open Kernel Module for x86_64 550.107.02 Release Build (portage@localhost) Thu 19 Sep 22:54:02 CEST 2024
Sep 19 23:02:20 gentoo kernel: usb 6-4.4: new SuperSpeed USB device number 3 using xhci_hcd
Sep 19 23:02:20 gentoo kernel: nvidia-modeset: Loading NVIDIA UNIX Open Kernel Mode Setting Driver for x86_64 550.107.02 Release Build (portage@localhost) Thu 19 Sep 22:53:46 CEST 2024
Sep 19 23:02:20 gentoo kernel: [drm] [nvidia-drm] [GPU ID 0x00000a00] Loading driver
Sep 19 23:02:20 gentoo kernel: Loading firmware: nvidia/550.107.02/gsp_ga10x.bin |
Plasma is still sluggish and kwin_wayland still hugging one CPU, though.
I ran | Code: | | perf top -K -p <kwin_wayland PID> |
and it showed the following:
| Code: |
12.19% libQt6Gui.so.6.7.2 [.] 0x00000000004b5ac5
7.26% libQt6Gui.so.6.7.2 [.] 0x00000000004b4bf9
6.35% libQt6Gui.so.6.7.2 [.] 0x00000000004b4bf5
5.96% libQt6Gui.so.6.7.2 [.] 0x00000000004b4c01
5.39% libQt6Gui.so.6.7.2 [.] 0x00000000004b4bf0
5.33% libQt6Gui.so.6.7.2 [.] 0x00000000004b5aca
4.63% libQt6Gui.so.6.7.2 [.] 0x00000000004b4c11
4.39% libQt6Gui.so.6.7.2 [.] 0x00000000004b4c09
3.83% libQt6Gui.so.6.7.2 [.] 0x00000000004b5b2c
3.82% libQt6Gui.so.6.7.2 [.] 0x00000000004b5acc
3.57% libQt6Gui.so.6.7.2 [.] 0x00000000004b5ac1
3.28% libQt6Gui.so.6.7.2 [.] 0x00000000004b5ad3
3.03% libQt6Gui.so.6.7.2 [.] 0x00000000004b5ace
2.56% libQt6Gui.so.6.7.2 [.] 0x00000000004b5b04
2.50% libQt6Gui.so.6.7.2 [.] 0x00000000004b5b08
2.34% libQt6Gui.so.6.7.2 [.] 0x00000000004b5b0d
(dozens of lines more)
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This prompted me to "revdep-rebuild" everything that depends on Qt6, which took quite a while, but didn't help.
I would simply switch to X11 as I don't strictly *need* Wayland, but under X11 I get a notification that software rendering is being used because some libraries seem to be missing, and there are a lot of graphics glitches, so it isn't really useable. I haven't got time to try to sort that out.
Is there anything else I could try to analyze or even fix this problem? I'm using an NVIDIA 4090.
EDIT #2: When I boot the previous kernel (6.10.8-gentoo-dist), everything works fine. It seems to be using the same nvidia-driver version, and of course all the other packages are the same, so it seems to be a kernel problem...? Any tips on how to analyze and possibly report that? |
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Kernel & Hardware
