su -c " echo 3000000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
echo 3000000 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq
echo 3000000 > /sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq
echo 3000000 > /sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq"
echo "scaling done"