Very slow application start on X11 under VMware (due to udev polling)
| Task Info (Flyspray) | |
|---|---|
| Opened By | Stefan Hoffmeister (shoffmeister) |
| Task ID | 80292 |
| Type | Bug Report |
| Project | Arch Linux |
| Category | Packages: Extra |
| Version | None |
| OS | All |
| Opened | 2023-11-19 16:32:48 UTC |
| Status | Assigned |
| Assignee | Andreas Radke (AndyRTR) |
Details
With the bugfix from https://bugs.archlinux.org/task/80284, processes using the Xorg X11 server (via libdrm) start with massive latency on VMware Workstation; this is not unexpected given the information present in task #80284.
The root cause for this is an interaction between a crude busy poll loop in libdrm, virtualization software taking a long time, and a change in libdrm which amplified these challenges.
The net effect is that, as-is, every process connecting to Xorg will get a startup penalty of at, say, 1.8 seconds (measured locally); I am also seeing delays of up to 2.8 seconds (most likely caused by usleep or stat timing/performance under varying virtualization config). This presents itself as
- very long time to desktop environment shell (under X11)
- applications such as KDE konsole starting with a delay of 1.8+ seconds
https://discussion.fedoraproject.org/t/x11-huge-delay-for-each-process-vmware-workstation-regression/95708 talks alot about this, https://github.com/shoffmeister/drm/commit/db85c9dc0553414ca77d5442fb7c203f550f267a has a hack to make things work better again.