On Fri, 27 Jun 2008 17:13:24 +0100 Richard Hughes <hughsient@xxxxxxxxx> wrote: > 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? > I totally agree with your suggestions. -- If you want to reach me at my work email, use arjan@xxxxxxxxxxxxxxx For development, discussion and tips for power savings, visit http://www.lesswatts.org _______________________________________________ Fedora-kernel-list mailing list Fedora-kernel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-kernel-list
