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| .\" | |||||
| .\" Copyright (c) 2019 Intel Corporation | |||||
| .\" | |||||
| .\" Redistribution and use in source and binary forms, with or without | |||||
| .\" modification, are permitted provided that the following conditions | |||||
| .\" are met: | |||||
| .\" 1. Redistributions of source code must retain the above copyright | |||||
| .\" notice, this list of conditions and the following disclaimer. | |||||
| .\" 2. Redistributions in binary form must reproduce the above copyright | |||||
| .\" notice, this list of conditions and the following disclaimer in the | |||||
| .\" documentation and/or other materials provided with the distribution. | |||||
| .\" | |||||
| .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
| .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
| .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
| .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
| .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
| .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
| .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
| .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
| .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
| .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
| .\" SUCH DAMAGE. | |||||
| .\" | |||||
| .\" $FreeBSD$ | |||||
| .\" | |||||
| .Dd October 17, 2019 | |||||
| .Dt HWPSTATE_INTEL 4 | |||||
| .Os | |||||
| .Sh NAME | |||||
| .Nm hwpstate_intel | |||||
| .Nd Intel Speed Shift Technology driver | |||||
| .Sh SYNOPSIS | |||||
| To compile this driver into your kernel | |||||
| place the following line in your kernel | |||||
| configuration file: | |||||
| .Bd -ragged -offset indent | |||||
| .Cd "device cpufreq" | |||||
| .Ed | |||||
| .Sh DESCRIPTION | |||||
| The | |||||
| .Nm | |||||
| driver provides support for hardware-controlled performance states on Intel | |||||
| platforms, also known as Intel Speed Shift Technology. | |||||
| .Sh LOADER TUNABLES | |||||
| .Bl -tag -width indent | |||||
| .It Va hint.hwpstate_intel.0.disabled | |||||
| Can be used to disable | |||||
| .Nm , | |||||
| allowing other compatible drivers to manage performance states, like | |||||
| .Xr est 4 . | |||||
| .Pq default 0 | |||||
| .El | |||||
| .Sh SYSCTL VARIABLES | |||||
| The following | |||||
| .Xr sysctl 8 | |||||
| values are available | |||||
| .Bl -tag -width indent | |||||
| .It Va dev.hwpstate_intel.%d.\%desc | |||||
| Describes the attached driver | |||||
| .It dev.hwpstate_intel.0.%desc: Intel Speed Shift | |||||
| .It Va dev.hwpstate_intel.%d.\%driver | |||||
| Driver in use, always hwpstate_intel. | |||||
| .It dev.hwpstate_intel.0.%driver: hwpstate_intel | |||||
| .It Va dev.hwpstate_intel.%d.\%parent | |||||
| .It dev.hwpstate_intel.0.%parent: cpu0 | |||||
| The cpu that is exposing these frequencies. | |||||
| For example | |||||
| .Va cpu0 . | |||||
| .It Va 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. | |||||
| .It dev.hwpstate_intel.0.epp: 0 | |||||
| .El | |||||
| .Sh COMPATIBILITY | |||||
| .Nm | |||||
| is only found on supported Intel CPUs. | |||||
| .Sh SEE ALSO | |||||
| .Xr cpufreq 4 | |||||
| .Rs | |||||
| .%T "Intel 64 and IA-32 Architectures Software Developer Manuals" | |||||
| .%U "http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html" | |||||
| .Re | |||||
| .Sh AUTHORS | |||||
| This manual page was written by | |||||
| .An D Scott Phillips Aq Mt scottph@FreeBSD.org . | |||||