Re: [PATCHSET] 0/3 Dynamic cpufreq governor and updates to ACPI P-state driver

[mru@kth.se (Måns Rullgård)]

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
stepping	: 7
cpu MHz		: 2069.912
cache size	: 512 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
bogomips	: 4087.80



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mru@kth.se