On Thu, 24 Jun 2021 at 04:54, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote: > > 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 I'm not sure that I understand your point. The formula above says that cpu8 run @ 53% of nominal performance > > > > 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
