[Bug 256594] AMD Ryzen CPU stutter

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 14 Jun 2021 08:52:37 UTC 
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: bugs@FreeBSD.org
          Reporter: xxjack12xx@gmail.com

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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