$ cpufreq-set --help
cpufrequtils 008: cpufreq-set (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
Usage: cpufreq-set [options]
Options:
-c CPU, --cpu CPU number of CPU where cpufreq settings shall be modified
-d FREQ, --min FREQ new minimum CPU frequency the governor may select
-u FREQ, --max FREQ new maximum CPU frequency the governor may select
-g GOV, --governor GOV new cpufreq governor
-f FREQ, --freq FREQ specific frequency to be set. Requires userspace
governor to be available and loaded
-r, --related Switches all hardware-related CPUs
-h, --help Prints out this screen
Notes:
1. Omitting the -c or --cpu argument is equivalent to setting it to zero
2. The -f FREQ, --freq FREQ parameter cannot be combined with any other parameter
except the -c CPU, --cpu CPU parameter
3. FREQuencies can be passed in Hz, kHz (default), MHz, GHz, or THz
by postfixing the value with the wanted unit name, without any space
(FREQuency in kHz =^ Hz * 0.001 =^ MHz * 1000 =^ GHz * 1000000).
说明：
-f 指定常用的策略，包括：
powersave 省电模式
userspace 自定义频率模式
ondemand 默认模式，当有 cpu 计算量的任务，会立即达到最大频率运行，完成后立即回到最低频率
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