缘由
手里的一块全志 H3 ARM开发板， 啥都不干， CPU烫的厉害。
系统里运行的业务很闲，不需要很高的性能。
干脆，关掉3个核心， 只开启一个CPU核心, 再设置为最省电的模式。
关闭其他核心
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| root@localhost:~# echo 0 > /sys/devices/system/cpu/cpu3/online
root@localhost:~# echo 0 > /sys/devices/system/cpu/cpu2/online
root@localhost:~# echo 0 > /sys/devices/system/cpu/cpu1/online
验证:
root@localhost:~# lscpu
Architecture: armv7l
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0
Off-line CPU(s) list: 1-3
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 1
Model name: ARMv7 Processor rev 5 (v7l)
CPU max MHz: 1008.0000
CPU min MHz: 480.0000
root@localhost:~#
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设置CPU运行模式
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| root@localhost:~# echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
验证:
root@localhost:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
480000
root@localhost:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
480000
root@localhost:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
1008000
root@localhost:~#
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ARM H3 CPU的温度
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| root@localhost:~# cat /sys/devices/virtual/thermal/thermal_zone0/temp
40701
root@localhost:~#
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