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Message-ID: <20161018004606.GA5559@comcast.net> Date: Mon, 17 Oct 2016 19:46:06 -0500 From: Tim Walberg <twalberg@...cast.net> To: linux-kernel@...r.kernel.org Subject: 4.8.1 regression with cpufreq governors 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. -- twalberg@...il.com, twalberg@...cast.net
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