https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234733
Bug ID: 234733
Summary: Setting CPU frequency with sysctl dev.cpu.0.fr slows a
Ryzen 2700X down
Product: Base System
Version: 12.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Issuing
sysctl dev.cpu.0.fr=3700
or any other value for frequency slows the system down by nearly 50%.
System has a Ryzen 2700X as a CPU.
How to repeat:
Reboot the system with all power saving tools disabled.
Compile the world, it will take around 2h30min on the system mentioned above if
that system call is never used.
Now issue the command
sysctl dev.cpu.0.fr=3700
which would bring a Ryzen 2700X to its nominal operating frequency.
Compile the world, it will take now around 4h30min.
I could repeat this error several times thinking originally that it is a powerd
problem.
An e-mail by Andrea Venturoli (21 Dec 2018 17:40:49) made me look a bit into
powerd.
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