https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295941
Bug ID: 295941
Summary: Minisforum MS01 instability after 7b26353a59d6
hwpstate_intel: Disable package control on hybrid CPU
Product: Base System
Version: 16.0-CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I'm opening this bug as requested by Adrian & so that others can find the bug
in case the have the same problem. I'm not asking for a reversion of the
commit mentioned in the subject.
I have a Minisforum MS-01, which is basically a laptop CPU in a desktop
motherboard that I use as a workstation. It is running the latest firmware
(1.27). When I first got the box last summer, I would encounter the box
powering cycling as soon as I typed make -j20 buildkernel if
dev.hwpstate_intel.X.epp was set lower than 44. So I added setting those
sysctls to 44 to /etc/sysctl.conf and forgot about it.
After I upgraded to a recent main version (1ee4b5fd824a fork: Drop an uneeded
PHOLD/PRELE pair), the instability returned. And was present for even higher
values of epp (I think I even tried 100). I tried reverting 7b26353a59d6 and
it "fixed" the problem.
I asked claude for help, and it told me about iccmax, which caps the
instantaneous CPU power. Setting this to 8*100 seems to solve my issues (it
defaults to 8*210). Setting is done as: cpucontrol -m 0x601=0x320 /dev/cpuctl0
I suspect this is something about a 110v supply on a US power brick vs a 220v
supply on a Chinese power brick.
Adrian asked me to raise this issue to point out how power saving changes can
have odd effects.
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