1.\"- 2.\" Copyright (c) 2015 Imre Vadász 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.Dd August 12, 2015 27.Dt COREPOWER 4 28.Os 29.Sh NAME 30.Nm corepower 31.Nd device driver for Intel Core on-die power usage estimation 32.Sh SYNOPSIS 33To compile this driver into the kernel, 34place the following line in your 35kernel configuration file: 36.Bd -ragged -offset indent 37.Cd "device corepower" 38.Ed 39.Pp 40Alternatively, to load the driver as a 41module at boot time, place the following line in 42.Xr loader.conf 5 : 43.Bd -literal -offset indent 44corepower_load="YES" 45.Ed 46.Sh DESCRIPTION 47The 48.Nm 49driver provides support for Intel's on-die power usage estimation, that is 50provided in Sandy Bridge and newer Core and Xeon CPUs, and in Atom CPUs 51of the Silvermont and newer architectures. 52The values are exposed through the 53.Dv HW_SENSORS 54.Xr sysctl 3 55tree. 56For example: 57.Bd -literal -offset indent 58% sysctl hw.sensors 59hw.sensors.cpu_node0.power0: 0.84 W (node0 Package Power) 60hw.sensors.cpu_node0.power1: 0.73 W (node0 DRAM Power) 61hw.sensors.cpu_node0.power2: 0.02 W (node0 Cores Power) 62hw.sensors.cpu_node0.power3: 0.00 W (node0 Graphics Power) 63.Ed 64.Pp 65Both the 66.Dq Cores Power 67and the 68.Dq Graphics Power 69values are included in the 70.Dq Package Power 71value, which estimates the total power usage of the CPU package. 72.Sh SEE ALSO 73.Xr systat 1 , 74.Xr sysctl 3 , 75.Xr devctl 4 , 76.Xr devd 8 , 77.Xr sensorsd 8 , 78.Xr sysctl 8 79.Sh HISTORY 80The 81.Nm 82driver first appeared in 83.Dx 4.3 . 84.Sh AUTHORS 85.An -nosplit 86The 87.Nm 88driver was written by 89.An Imre Vadasz Aq Mt imre@vdsz.com . 90.Sh BUGS 91For some Xeon and Core-i CPUs this driver might incorrectly assume that the 92MSR_PP1_ENERGY_STATUS MSR for measuring power usage of the integrated GPU is 93available. 94