About the kernel configuration(CONFIG_CPU_FREQ and CONFIG_CPU_IDLE.)

[孙世龙 sunshilong]

Updated:
I check the frequency of the CPU by `cat /proc/cpuinfo`.

On Wed, Jan 19, 2022 at 9:23 AM 孙世龙 sunshilong <sunshilong369 at gmail.com>
wrote:

> Hi, list
> I am using Linux 5.4.78 with PREEMPT_RT patch.
> Hardware name: UNO-2372G-J021AE.
>
> It's strange that the frequency of the CPU is not constant(i.e.
> not fixed at a specific frequency) if I both disable CONFIG_CPU_FREQ
> and CONFIG_CPU_IDLE
> whereas
> the frequency of the CPU is constant if I only disable CONFIG_CPU_FREQ
> (leave CONFIG_CPU_IDLE enabled).
>
> Could somebody please shed some light on this matter?
>
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