[Bug 225782] Ryzen: unable to set cpu freq

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225782

--- Comment #3 from Conrad Meyer  ---
(In reply to rozhuk.im from comment #2)
> PS: probably proper thing to not set freq if /-1 in
> dev.hwpstate.0.freq_settings to prevent performance degradation.

This should still work.  I think the problem was buggy BIOS.

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[Bug 225782] Ryzen: unable to set cpu freq

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225782

rozhuk...@gmail.com changed:

   What|Removed |Added

 Resolution|--- |Works As Intended
 Status|New |Closed

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[Bug 225782] Ryzen: unable to set cpu freq

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225782

--- Comment #2 from rozhuk...@gmail.com ---
(In reply to Conrad Meyer from comment #1)
Update BIOS, remove fixed freq in BIOS.
dev.hwpstate.0.freq_settings: 3500/4331 3000/3450 1550/1331
dev.cpu.0.freq_levels: 3500/4331 3000/3450 1550/1331
on latest 11.1

sorry for noise.

PS: probably proper thing to not set freq if /-1 in
dev.hwpstate.0.freq_settings to prevent performance degradation.

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[Bug 225782] Ryzen: unable to set cpu freq

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225782

--- Comment #1 from Conrad Meyer  ---
If this is also true on CURRENT, it looks like a buggy BIOS.  Your BIOS isn't
reporting P-states via ACPI or you would see a second positive number instead
of "/-1".  It's possible the BIOS bug also breaks P-state setting.  If a BIOS
update is available from your vendor, consider applying it.

If this works on CURRENT, great.  I don't support stable branches, so I would
just unsubscribe from this bug in that case.

In either case, I'd suggest rebooting and just not setting dev.cpu.0.freq
(leaving the machine in P0).  At idle, FreeBSD enters power-saving C-states and
won't consume any more power than if you were also downclocked.

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[Bug 225782] Ryzen: unable to set cpu freq

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225782

Bug ID: 225782
   Summary: Ryzen: unable to set cpu freq
   Product: Base System
   Version: 11.1-STABLE
  Hardware: Any
OS: Any
Status: New
  Severity: Affects Many People
  Priority: ---
 Component: kern
  Assignee: freebsd-bugs@FreeBSD.org
  Reporter: rozhuk...@gmail.com

After boot was:
dev.hwpstate.0.freq_settings: 3500/-1 3500/-1 1550/-1
dev.cpu.0.freq_levels: 3500/-1 3500/-1 1550/-1
dev.cpu.0.freq: 1550

After set:
dev.cpu.0.freq=3500
perfomance degraded to ~50%

Returning dev.cpu.0.freq=1550 does not help with performance.
11.1-STABLE FreeBSD 11.1-STABLE  r328439M  amd64
Ryzen 1300X, no overclock, fixed freq and Voltage in BIOS.

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