Messages in this thread | | | Subject | Re: [PATCH V3 0/4] cpufreq: cppc: Add support for frequency invariance | From | Qian Cai <> | Date | Sat, 26 Jun 2021 09:41:27 -0400 |
| |
On 6/25/2021 10:29 PM, Qian Cai wrote: > Ionela, I found that set ACPI_PROCESSOR=y instead of ACPI_PROCESSOR=m will fix the previous mentioned issues here (any explanations of that?) even though the scaling down is not perfect. Now, we have the following on this idle system: > > # cat /sys/devices/system/cpu/*/cpufreq/cpuinfo_cur_freq | sort | uniq -c > 79 1000000 > 1 1160000 > 73 1400000 > 1 2000000 > 4 2010000 > 1 2800000 > 1 860000 > > Even if I rerun a few times, there could still have a few CPUs running lower than lowest_perf (1GHz). Also, even though I set all CPUs to use "userspace" governor and set freq to the lowest. A few CPUs keep changing at will. > > # cat /sys/devices/system/cpu/*/cpufreq/cpuinfo_cur_freq | sort | uniq -c > 156 1000000 > 3 2000000 > 1 760000
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
| |