BlueBuildB
BlueBuild•2y ago•
50 replies
louissunk

High CPU Usage by systemd-udevd Leading to System Stuttering on Fedora Atomic-based Systems

I am experiencing severe system stuttering on Fedora Atomic-based systems, particularly noticeable when starting multiple Docker containers or performing tasks such as mvn clean install. The stuttering affects audio playback (Spotify, voice calls) and mouse movement.

System Details: ryzen 7950x3d+64gb+amd 7900GRE+2tb nvme drive

Previous Setup (No Issues): Fedora i3wm Spin - Used for over a year without encountering any problems.
Problematic Setups:
- ublue-os Aurora: Encountered the issue after switching from i3wm to this Atomic-based setup. Unable to resolve, reverted to previous setup.
- Custom Image (based on wayblue sway image): Recently installed on the same machine, replicated the issue observed in Aurora.

The same custom image works fine on a different machine the previous week.

This issue manifests as system.slice/systemd-udevd/udev consuming an excessively high amount of CPU, up to 2000%. (only seen with systemd-cgtop, not with top,htop,btop, mission control)
when monitoring udevadm monitor I do see
KERNEL[20546.524311] remove   /devices/virtual/net/veth15367bb/queues/rx-0 (queues)
KERNEL[20546.524320] remove   /devices/virtual/net/veth15367bb/queues/tx-0 (queues)
KERNEL[20546.524360] remove   /devices/virtual/net/veth15367bb (net)
UDEV  [20546.527429] add      /devices/virtual/net/veth6686c49 (net)
UDEV  [20546.557393] remove   /devices/virtual/net/veth6686c49/queues/rx-0 (queues)
UDEV  [20546.558055] remove   /devices/virtual/net/veth6686c49/queues/tx-0 (queues)
UDEV  [20546.596101] remove   /devices/virtual/net/veth15367bb/queues/tx-0 (queues)
UDEV  [20546.596834] remove   /devices/virtual/net/veth6686c49 (net)
UDEV  [20546.611493] remove   /devices/virtual/net/veth15367bb (net)

I do not know what this means, Only happens under load....

I do not know how to solve thisand how to find the cause. Are there any known issues or bugs with systemd-udevd on Fedora Atomic-based systems?
Suggestions for further diagnostics ?

Thanks
Solution
So I was able to reproduce this on all my machines and on stock bluefin as well, i can remove the issue by shutting down systemd.udevd service. this can be closed, when I am back from holiday I will make a ticket with ublue os or silverblue fedora depending on if I can reproduce this on silverblue stock with docker layered as well
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