Cpufrequtils: Why should I care, and acpi-cpufreq vs. p4_clockmod

I'm a cpufrequtils newbie. In the years I've been running Arch on my laptop, I've never set it up.
I wonder, why should I care about cpufrequtils? What should I know about the technology as a laptop user? Does the fact that I rarely unplug make a difference?
I also wonder what module I should be using for frequency scaling. The cpufrequtils article recommends acpi-cpufreq, but the article for my specific laptop recommends p4_clockmod (for some unspecified reason).
Any insight would be greatly appreciated. Thanks in advance!

Just modprobe both acpi-cpufreq and p4-clockmod, only one of them should be able to load.
the article wrote:
For older Intel CPUs, the command above may return with:
FATAL: Error inserting acpi_cpufreq ([...]/acpi-cpufreq.ko): No such device
In this case, replace the kernel module acpi-cpufreq with speedstep-centrino, p4-clockmod or speedstep-ich.
CPU frequency scaling saves power and keeps your processor cooler. It's worth using on a desktop or a server, not just a laptop.
If you use the ondemand governor, and add:
(sleep 5 && echo 11 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold)
to /etc/rc.local, you'll have basically zero performance loss. Usually it scales up the CPU at 95%, with this it will do it at 11% (you can't go lower atm).
You can load the "cpufreq_stats" module and see what it's doing with cpufreq-info. You should notice your laptop fan spin down quite a bit once you set it up.
If you have a watt meter, you can take out the battery and see the power use drop from something like 17w to 12w.
Last edited by thestinger (2010-11-26 05:18:31)

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Cpufrequtils: Why should I care, and acpi-cpufreq vs. p4_clockmod

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