DragonFly On-Line Manual Pages

COREPOWER(4)          DragonFly Kernel Interfaces Manual          COREPOWER(4)

NAME
     corepower -- device driver for Intel Core on-die power usage estimation

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

           device corepower

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           corepower_load="YES"

DESCRIPTION
     The corepower driver provides support for Intel's on-die power usage
     estimation, that is provided in Sandy Bridge and newer Core and Xeon
     CPUs, and in Atom CPUs of the Silvermont and newer architectures.  The
     values are exposed through the HW_SENSORS sysctl(3) tree.  For example:

           % sysctl hw.sensors
           hw.sensors.cpu_node0.power0: 0.84 W (node0 Package Power)
           hw.sensors.cpu_node0.power1: 0.73 W (node0 DRAM Power)
           hw.sensors.cpu_node0.power2: 0.02 W (node0 Cores Power)
           hw.sensors.cpu_node0.power3: 0.00 W (node0 Graphics Power)

     Both the ``Cores Power'' and the ``Graphics Power'' values are included
     in the ``Package Power'' value, which estimates the total power usage of
     the CPU package.

SEE ALSO
     systat(1), sysctl(3), devctl(4), devd(8), sensorsd(8), sysctl(8)

HISTORY
     The corepower driver first appeared in DragonFly 4.3.

AUTHORS
     The corepower driver was written by Imre Vadasz <imre@vdsz.com>.

BUGS
     For some Xeon and Core-i CPUs this driver might incorrectly assume that
     the MSR_PP1_ENERGY_STATUS MSR for measuring power usage of the integrated
     GPU is available.

DragonFly 4.3                   August 12, 2015                  DragonFly 4.3