Messages in this thread | | | Subject | RE: [PATCHSET] 0/3 Dynamic cpufreq governor and updates to ACPI P-state driver | Date | Tue, 21 Oct 2003 18:48:18 -0700 | From | "Pallipadi, Venkatesh" <> |
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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.
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