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SubjectRE: [PATCHSET] 0/3 Dynamic cpufreq governor and updates to ACPI P-state driver
Date
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> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of
> Alexander Bokovoy
> Sent: Tuesday, October 21, 2003 2:11 PM
> To: M?ns Rullg?rd
> Cc: cpufreq@www.linux.org.uk; linux-kernel@vger.kernel.org
> Subject: Re: [PATCHSET] 0/3 Dynamic cpufreq governor and
> updates to ACPI P-state driver
>
>
> On Tue, Oct 21, 2003 at 10:39:16PM +0200, M?ns Rullg?rd wrote:
> > Alexander Bokovoy <ab@altlinux.org> writes:
> >
> > >> > Most of the latest CPUs (laptop CPUs in particular)
> have feature
> > >> > which enable very low latency P-state transitions
> > >> > (like Enhanced Speedstep Technology-EST). Using this feature,
> > >> > we can have a lightweight in kernel cpufreq governor,
> > >> > to vary CPU frequency depending on the CPU usage. The
> > >> > advantage being low power consumption and also cooler laptops.
> > >>
> > >> So, I took this thing for a spin, but it didn't work at
> all. I loaded
> > >> the module, and did "echo demandbased >
> /sys/.../scaling_governor".
> > >> This echo never returned, and the keyboard locked up.
> After a little
> > >> while, the fan started running at full speed. I managed
> to cut and
> > >> paste into an xterm and start top, which showed nothing
> unusual. I
> > >> could shut down and reboot normally.
> > > I applied these patches to stock 2.6.0-test8 and selected
> 'demandbased' as
> > > default governor. In result, everything worked from the
> very beginning, my
> > > Centrino-based system went to 600MHz and was upping when
> load was going
> > > higher during compilation or disk access but went down
> when load was
> > > lowering. So it works well for me.
> >
> > What's your /proc/cpuinfo? Mine says
> >
> > processor : 0
> > vendor_id : GenuineIntel
> > cpu family : 15
> > model : 2
> > model name : Mobile Intel(R) Pentium(R) 4 - M CPU 1.80GHz


AFAIK, Pentium 4 M does not support EST (Frequency transitions with low
latency).
But that doesn't explain why it is hanging though. Which speedstep
driver are you using?
P4-clockmod? Or acpi? Can you send the complete dmesg.


Thanks,
-Venkatesh
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