Installing ATLAS for Kaldi by disabling CPU Throttling on Archlinux

I was trying to compile ATLAS (Automatically Tuned Linear Algebra Software) to install Kaldi on my new archlinux computer, and I ran into this error :

CPU Throttling apparently enabled!
It appears you have cpu throttling enabled, which makes timings
unreliable and an ATLAS install nonsensical. Aborting.
See ATLAS/INSTALL.txt for further information
xconfig exited with 1

Of course, the first thing I did was to check Google for the error, and the answer was pretty clear: disable CPU Throttling. "Cool story bro", but how can I do it?

I had to set the scaling governor of my cpus to performance. So did I.

First by modifying directly the files with this command line (using bash):

for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done

Of course, it didn't work.

Then, as mentionned on the Archlinux wiki page I used cpupower:

cpupower frequency-set -g performance

Of course again, it didn't work.

Then I found the Holy Grail with this post on StackExchange. The problem is specific to the intel_pstate governor (default for Intel Sandy Bridge and Ivy Bridge CPUs as of kernel 3.9). So the solution is simply to disable it and load the acpi-cpufreq module. And Ta-da!

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