[Bug 294513] amd64 loader(8) could do with a hw.ncpu tunable

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From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 14 Apr 2026 10:22:34 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294513

            Bug ID: 294513
           Summary: amd64 loader(8) could do with a hw.ncpu tunable
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dch@freebsd.org

At least on arm64, we can limit # of cpus in loader.conf via
`hw.ncpu=4` and this is very handy for testing & debugging.

There appears to be no equivalent for amd64, other than the
brutal `kern.smp.disabled=1`.

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