Intel Has More P-State Changes Coming For Linux 4.12
Rafael Wysocki, Linux power management expert and Intel developer, has posted a new set of patches for further tuning P-State's CPU frequency scaling behavior.
He commented on at the opening of the patch series, "This series of patches makes changes to intel_pstate that will modify its behavior in visible ways and add documentation describing the driver's interface and behavior after those changes. It is targeted at 4.12."
The patches affect the P-State active mode (default) behavior as it has turned out to be problematic and the new behavior is explained with this patch. One of the other patches now uses the load-based P-State mode selection more widely, for basically all hardware except servers -- as defined by the ACPI preferred profile. Another patch supports HWP processors in all operation modes.
As usual whenever there's a large CPUFreq/P-State change, we'll have fresh benchmarks with the different drivers and governors when Linux 4.12 rolls into town.