On Fri, 26 Mar 2010, Jeremy Chadwick wrote:
[ leaving the MB monitoring stuff alone for your expert attention :-]
> > It jumped up in vcore a little there with powerd. C1E and C2E which
> > include P-states are what I am really after and I think that the
> > bios by itself provides those changes better than any other changes
> > in these settings.
>
> ...and this would fall under the est(4) subset driver for cpufreq(4).
Just checking, I know nothing about these so far, but are you suggesting
that John having C1E and C2E enabled in BIOS may be affecting ACPI/EST
detection, and that things may be different were these disabled?
If that's not what you meant, could you expand a little?
John: you may want to explore where this comes together in kern_cpu.c
where you'll see those cpufreq debugging messages you quoted. Some of
the more gritty documentation may be found browsing with something like:
% less /sys/{sys,kern,amd64/include}/*cpu*.[ch]
cheers, Ian
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