https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256594
Bug ID: 256594
Summary: AMD Ryzen CPU stutter
Product: Base System
Version: 13.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Using current CPU: AMD Ryzen 7 5800X 8-Core Processor (3800.07-MHz
K8-class CPU)
When running X on 13-STABLE, everything has a micro delay. When playing videos,
the video keeps stuttering and audio periodically skips. Dragging things are
not smooth, screen keeps stalling. An exact description of the problem was
reported on the mailing list
https://lists.freebsd.org/pipermail/freebsd-current/2021-March/079235.html
Setting kern.sched.steal_thresh=0 made the problem go away completely.
Anything higher than 0 produces noticeable stuttering and delays in visuals and
audio.
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