Re: [PATCH V3 0/4] cpufreq: cppc: Add support for frequency invariance

[Viresh Kumar]

On 26-06-21, 09:41, Qian Cai wrote:
> Another date point is that set ACPI_CPPC_CPUFREQ_FIE=n fixed the issue that any CPU could run below the lowest freq.
> 
> schedutil:
> # cat /sys/devices/system/cpu/*/cpufreq/cpuinfo_cur_freq | sort | uniq  -c
>      80 1000000
>      78 1400000
>       1 2010000
>       1 2800000
> 
> userspace:
> # cat /sys/devices/system/cpu/*/cpufreq/cpuinfo_cur_freq | sort | uniq  -c
>     158 1000000
>       2 2000000

ACPI_CPPC_CPUFREQ_FIE can play a role with schedutil, but not with
userspace governor. Userspace doesn't use the values being updated by
ACPI_CPPC_CPUFREQ_FIE. So I think the CPUs may not have been idle,
just for some reason.

Also, now that you are able run on latest kernel (linux-next), it
would be better if we can talk in terms of that only going forward.
5.4 adds more to the already unstable results :)

-- 
viresh