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默认树莓派在一些情况下会自动降频，

查看频率脚本为：

sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

执行结果：

1500000

也可能是

 600000

临时设置频率

脚本名字为setcpHz.sh,忘了从哪抄的了，内容很简单，只是对文件赋值，内容为：

#!/bin/bash#本脚本用于调节CPU电源模式 #修改电源模式的路径 path_0=/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor path_1=/sys/devices/system/cpu/cpu1/cpufreq/scaling_governor path_2=/sys/devices/system/cpu/cpu2/cpufreq/scaling_governor path_3=/sys/devices/system/cpu/cpu3/cpufreq/scaling_governor #判断权限是否足够 if [ -w $path_0 ] && [ -w $path_1 ] && [ -w $path_2 ] && [ -w $path_3 ]; then     #解析输入参数     case $1 in           1)         echo "[Performance] 高性能模式"         mode=Performance         ;;           2)         echo "[ondemand] 自动调整"         mode=ondemand         ;;          3)         echo "[powersave] 低功耗模式"         mode=powersave         ;;         -r)         echo "[CPU 0]" `cat  $path_0`         echo "[CPU 1]" `cat  $path_1`         echo "[CPU 2]" `cat  $path_2`         echo "[CPU 3]" `cat  $path_3`         exit         ;;         -h)         echo  "输入参数：         [performance]  1          [ondemand ]  2          [powersave]  3          [读取模式 ] -r"         exit         ;;                  *)         echo "Erro: 输入参数错误"         exit          ;;     esac      #修改电源模式     echo $mode > $path_0     echo $mode > $path_1     echo $mode > $path_2     echo $mode > $path_3 else     echo "Erro: 权限不足" fi

执行：

sudo ./setcpuHZ 1

1为Performance模式。

永久修改模式

查看/ect/init.d/raspi-config

内容：

#!/bin/sh### BEGIN INIT INFO# Provides:          raspi-config# Required-Start: udev mountkernfs $remote_fs# Required-Stop:# Default-Start: S 2 3 4 5# Default-Stop:# Short-Description: Switch to ondemand cpu governor (unless shift key is pressed)# Description:### END INIT INFO. /lib/lsb/init-functionscase "$1" in  start)    log_daemon_msg "Checking if shift key is held down"    if [ -x /usr/sbin/thd ] && timeout 1 thd --dump /dev/input/event* | grep -q "LEFTSHIFT\|RIGHTSHIFT"; then      printf " Yes. Not enabling ondemand scaling governor"      log_end_msg 0    else      printf " No. Switching to ondemand scaling governor"      SYS_CPUFREQ_GOVERNOR=/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor      if [ -e $SYS_CPUFREQ_GOVERNOR ]; then        echo "ondemand" > $SYS_CPUFREQ_GOVERNOR        echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold        echo 100000 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate        echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor      fi      log_end_msg 0    fi    ;;  stop)    ;;  restart)    ;;  force-reload)    ;;  *)    echo "Usage: $0 start" >&2    exit 3    ;;esac

看到ondemand了吗？ondemand为按需进行设置频率，这里修改为performance保存重启就可以了，模式就为高性能模式，其他模式也就是改这个名字就好。

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