X86 openwrt How to set the cpu mode to performance

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My firmware download is: https://downloads.openwrt.org/releases/19.07.3/targets/x86/64/openwrt-19.07.3-x86-64-combined-ext4.img.gz

My device is: BESSTAR TECH LIMITED GK41
cpu: Intel(R) Celeron(R) J4125 CPU @ 2.00GHz

I try

echo performance >> /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
echo performance >> /sys/devices/system/cpu/cpufreq/policy1/scaling_governor
echo performance >> /sys/devices/system/cpu/cpufreq/policy2/scaling_governor
echo performance >> /sys/devices/system/cpu/cpufreq/policy3/scaling_governor
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy1/scaling_min_freq
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy2/scaling_min_freq
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy3/scaling_min_freq
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy1/scaling_min_freq
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy2/scaling_min_freq
echo 2700000 > /sys/devices/system/cpu/cpufreq/policy3/scaling_min_freq

Pass

cat /proc/cpuinfo |grep MHz|uniq

Inquire,
The current frequency of cpu has not reached the maximum, but dynamic,

But it did not take effect.
I have tried many versions, but the performance mode has always been powersave, which did not achieve continuous performance after booting.

Hope someone can help me.

In addition, I would like to know how to set up litmits for the boot process?

I can adjust the continuous high-performance mode on other systems, such as windows or ubuntu, but openwrt does not know how to adjust it.

Hope someone can help you yeah, wondering about this aswell