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

[Viresh Kumar]

On 23-06-21, 08:57, Qian Cai wrote:
> Viresh, I am afraid I don't feel comfortable yet. I have a few new tests in
> development, and will provide an update once ready.

Oh sure, np.

> Also, I noticed the delivered perf is even smaller than lowest_perf (100).

> # cat /sys/devices/system/cpu/cpu8/acpi_cppc/feedback_ctrs
>  ref:103377547901 del:54540736873
> # cat /sys/devices/system/cpu/cpu8/acpi_cppc/feedback_ctrs
>  ref:103379170101 del:54541599117
> 
> 100 * (54541599117 - 54540736873) / (103379170101 - 103377547901) = 53
> 
> My understanding is that the delivered perf should fail into the range between
> lowest_perf and highest_perf. Is that assumption correct? This happens on
> 5.4-based kernel, so I am in process running your series on that system to see
> if there is any differences. In any case, if it is a bug it is pre-existing,
> but I'd like to understand a bit better in that front first.

Vincent:

Can that happen because of CPU idle ?

-- 
viresh