HWPSTATE_INTEL(4)

NAME
hwpstate_intel - Intel Speed Shift Technology driver

SYNOPSIS
To compile this driver into your kernel place the following line in your kernel configuration file:

device cpufreq

DESCRIPTION
The hwpstate_intel driver provides support for hardware-controlled performance states on Intel platforms, also known as Intel Speed Shift Technology.

LOADER TUNABLES

hint.hwpstate_intel.0.disabled
    Can be used to disable hwpstate_intel, allowing other compatible drivers to manage performance states, like est(4). Defaults to "0" (enabled).

machdep.hwpstate_pkg_ctrl
    Selects between package-level control (the default) and per-core control. "1" selects package-level control and "0" selects core-level control.

SYSCTL VARIABLES
The following sysctl(8) values are available

dev.hwpstate_intel.%d.%desc
    Describes the attached driver

dev.hwpstate_intel.0.%desc: Intel Speed Shift

dev.hwpstate_intel.%d.%driver
    Driver in use, always hwpstate_intel.

dev.hwpstate_intel.0.%driver: hwpstate_intel

dev.hwpstate_intel.%d.%parent
    The CPU that is exposing these frequencies. For example cpu0.

dev.hwpstate_intel.0.%parent: cpu0

dev.hwpstate_intel.%d.epp
    Energy/Performance Preference. Valid values range from 0 to 100. Setting this field conveys a hint to the hardware regarding a preference towards performance (at value 0), energy efficiency (at value 100), or somewhere in between.

dev.hwpstate_intel.0.epp: 0

COMPATIBILITY
hwpstate_intel is only found on supported Intel CPUs.

SEE ALSO
cpufreq(4) Intel 64 and IA-32 Architectures Software Developer Manuals, http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html.

AUTHORS
This manual page was written by D Scott Phillips <scottph@FreeBSD.org>.