Problems with amd FX 8 core and freq scaling

[Sean Bruno]

On Mon, 2013-11-11 at 16:47 -0500, Jung-uk Kim wrote:
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> On 2013-11-11 16:31:30 -0500, Jung-uk Kim wrote:
> > On 2013-11-11 15:26:58 -0500, Adrian Chadd wrote:
> >> On 11 November 2013 12:00, Jung-uk Kim <jkim at freebsd.org> wrote:
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> >>> On 2013-11-11 13:16:47 -0500, Nicholas McKenzie wrote:
> >>>> But wouldn't this just disable frequency scaling and the
> >>>> whole point of powerd?
> >>> 
> >>> No.  acpi_throttle (and p4tcc) controls T-state.  "Frequency 
> >>> scaling" should be done by changing P-state.
> > 
> >> Right.
> > 
> >> IIRC, T-state is just for emergency temperature throttling. It 
> >> shouldn't be used outside of that.
> > 
> > 
> >>>>> There have been a number of reports of throttling causing 
> >>>>> crashes. This setting does not prevent powerd from
> >>>>> adjusting your CPU's clock, it just disables some arcane
> >>>>> feature which pre-dates the modern power management
> >>>>> methods.
> > 
> >> .. did anyone ever figure out why crashes would be caused by 
> >> T-state adjustment?
> > 
> > My memory is vague but I think it was not able to reject a broken
> > FADT or _PTC table, or something like that.
> 
> Just in case, here I attached the uncommitted (and untested) patch.
> 
> Jung-uk Kim
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Up and running this patch now on my FX-8150.  Anything interesting that
I should gather report?

sean
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