At the moment we set: # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y # CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set CONFIG_CPU_FREQ_GOV_PERFORMANCE=y CONFIG_CPU_FREQ_GOV_POWERSAVE=m CONFIG_CPU_FREQ_GOV_USERSPACE=y CONFIG_CPU_FREQ_GOV_ONDEMAND=m CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m This is not ideal from a power-saving point of view. In an ideal world we would: * remove CONFIG_CPU_FREQ_GOV_CONSERVATIVE -- ondemand does a better job on all workloads * remove CONFIG_CPU_FREQ_GOV_USERSPACE -- we have nothing in userspace that needs this sort of control, and if we did, the latency would be horrible * remove CONFIG_CPU_FREQ_GOV_POWERSAVE -- ondemand automatically throttles down to lowest, and is just a hardcoded state * compile into the kernel CONFIG_CPU_FREQ_GOV_ONDEMAND -- we really want to be running this on all systems that support it * set ONDEMAND or PERFORMANCE to default as USERSPACE is just changed to something else by cpuspeed. You really don't want to be using USERSPACE at all. Matthew Garrett and I are working on a latency profile for power management, and having all these modules potentially loaded is bad. Comments? Richard. _______________________________________________ Fedora-kernel-list mailing list Fedora-kernel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-kernel-list
