Persistently setting cpu frequency

I can't seem to set the cpu frequency. I've tried a number of utilities (e.g. cpufreqd / cpufrequtils), as well as just manually editing the cpu frequency using commands like:

Code:

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echo performance | sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq | sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

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Doing this works for a short time, but as soon as I do any cpu-intensive work, the file /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq seems to be overwritten.
This doesn't happen if I boot into android, and use an app like SetCPU, and then do the same amount of cpu work.