AMD Family 10h cpufreq driver

cpghost cpghost at
Tue Sep 23 15:50:48 UTC 2008

On Tue, Sep 23, 2008 at 03:55:28PM +0200, wrote:
> cpghost wrote:
> > On Tue, Sep 23, 2008 at 08:45:59AM +0900, G. Otsuji wrote:
> >   
> >> Hi,
> >> I foget to say that debug.cpufreq.lowest=1200 in 
> >> /boot/loader.conf and running powerd is my stable state.
> >>     
> >
> > I didn't test your patch yet, but this is the lowest freq I can
> > use on my
> >   AMD Phenom(tm) 9350e Quad-Core Processor (2000.08-MHz K8-class CPU)
> > running
> >   FreeBSD 7.1-PRE as of Sept 5.  (/i386 *and* /amd64)
> >
> > If I go below that, the system freezes hard, and I have to power cycle
> > the motherboard to recover. But, again, this is without your patch.
> > I look forward to test it as soon as I can. :)
> >   
> This may also be a hardware issue. Some buck converters on the
> motherboard's VRM (Voltage Regulator Module) do not like switching from
> very low idle drain to much higher one very quickly. I had one user
> report about that who uses Windows.
> Have you tried switching manually gradually down without any load? You
> need to change the debug.cpufreq.lowest together with dev.cpu.0.freq

The first time I've noticed this was when enabling powerd. As soon
as powerd reached 1200 from above, the machine froze. So I disabled
powerd and tried manually to switch dev.cpu.0.freq back one step at a
time (waiting quite some time, i.e. many minutes both idle and under
load). It didn't make any difference: motherboard freeze at ANY freq.
lower than 1200, wether switching fast or gradually, idle or not.

That's why I have debug.cpufreq.lowest="1240" in my /boot/loader.conf,
and why I hope that G. Otsuji's driver will help. :)

> Also, it would be nice if i could see the voltage levels somewhere (in
> sysctl?), but i haven't found it yet.

Yep, same here.

> Cheers,
> Veronica


Cordula's Web.

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