On 6/25/2021 6:21 AM, Ionela Voinescu wrote: >> scaling_driver: acpi_cppc > ^^^^^^^^^ > I suppose you mean "cppc-cpufreq"? > > "acpi_cppc" is not a scaling driver option. Ionela, yes. Sorry about that. > So your CPUs run at frequencies between 200MHz and 280MHz? 2000 to 2800 MHz. > Based on your acpi_cppc information below I would have assumed 2GHz as > lowest nonlinear and 2.8GHz as nominal. The reason for this is that > according to the ACPI spec the frequency values in the _CPC objects are > supposed to be in MHz, so 2800 MHz for nominal frequency would be > 2.8GHz. > > When you try more governors, make sure to check out the difference > between scaling_cur_freq and cpuinfo_cur_freq at [2]. The first gives > you the frequency that the governor (schedutil) is asking for, while the > second is giving you the current frequency obtained from the counters. > > So to check the actual frequency the cores are running at, please check > cpuinfo_cur_freq. The problem is that all CPUs are never scaling down. "cpuinfo_cur_freq" and "scaling_cur_freq" are always the 2800 MHz on all CPUs on this idle system. This looks like a regression somewhere as in 5.4-based kernel, I can see "cpuinfo_cur_freq" can go down to 2000 MHz in the same scenario. I'll bisect a bit unless you have better ideas?
