Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: 4.8.1 regression with cpufreq governors | Date | Tue, 18 Oct 2016 23:10:19 +0200 |
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On Monday, October 17, 2016 07:46:06 PM Tim Walberg wrote: > May or may not be related to similar reports, but here's what I've just observed > on my system. Built a stock kernel from tags/v4.8.1, relevant cpufreq bits: > > CONFIG_ACPI_CPU_FREQ_PSS=y > CONFIG_CPU_FREQ=y > CONFIG_CPU_FREQ_GOV_ATTR_SET=y > CONFIG_CPU_FREQ_GOV_COMMON=y > CONFIG_CPU_FREQ_STAT=y > CONFIG_CPU_FREQ_STAT_DETAILS=y > # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set > # CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set > # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set > # CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set > CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE=y > # CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL is not set > CONFIG_CPU_FREQ_GOV_PERFORMANCE=y > CONFIG_CPU_FREQ_GOV_POWERSAVE=m > CONFIG_CPU_FREQ_GOV_USERSPACE=m > CONFIG_CPU_FREQ_GOV_ONDEMAND=m > CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y > CONFIG_CPU_FREQ_GOV_SCHEDUTIL=m > # CONFIG_X86_PCC_CPUFREQ is not set > CONFIG_X86_ACPI_CPUFREQ=m > CONFIG_X86_ACPI_CPUFREQ_CPB=y > > > Conservative is set as default governer, yet when boot completes, all CPUs are > pegged at the highest frequency. Changing governor to powersave knocks them all > down to the lowest available frequency. Putting them back on conservative (or > ondemand) results in no change in frequency, despite generating load. Switching > to performance of course kicks them back up to high frequency. Basically, the > governors don't seem to be ... governing.
The "convervative" governor issue seems to be the one fixed recently (http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/commit/?h=pm-cpufreq&id=abb6627910a1e783c8e034b35b7c80e5e7f98f41).
I'm not sure why "ondemand" behaves incorrectly for you though.
Thanks, Rafael
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