AMDTEMP(4) FreeBSD Kernel Interfaces Manual AMDTEMP(4)
NAME
amdtemp - device driver for AMD processor on-die digital thermal sensor
SYNOPSIS
To compile this driver into the kernel, place the following line in your
kernel configuration file:
device amdtemp
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
amdtemp_load="YES"
DESCRIPTION
The amdtemp driver provides support for the on-die digital thermal sensor
present in AMD Family 0Fh, 10h, 11h, 12h, 14h, 15h, 16h, and 17h
processors.
For Family 0Fh processors, the amdtemp driver reports each core's
temperature through sysctl nodes, named
dev.amdtemp.%d.core{0,1}.sensor{0,1}. The driver also creates
dev.cpu.%d.temperature in the corresponding CPU device's sysctl tree,
displaying the maximum temperature of the two sensors located in each CPU
core.
For Family 10h, 11h, 12h, 14h, 15h, 16h, and 17h processors, the driver
reports each package's temperature through a sysctl node, named
dev.amdtemp.%d.core0.sensor0. The driver also creates
dev.cpu.%d.temperature in the corresponding CPU device's sysctl tree,
displaying the temperature of the shared sensor located in each CPU
package.
SYSCTL VARIABLES
The following variable is available as both sysctl(8) variable and
loader(8) tunable:
dev.amdtemp.%d.sensor_offset
Add the given offset to the temperature of the sensor. Default is 0.
SEE ALSO
coretemp(4), loader(8), sysctl(8)
HISTORY
The amdtemp driver first appeared in FreeBSD 7.1.
AUTHORS
Rui Paulo <
[email protected]>
Norikatsu Shigemura <
[email protected]>
Jung-uk Kim <
[email protected]>
CAVEATS
For Family 10h and later processors, "(the reported temperature) is a
non-physical temperature measured on an arbitrary scale and it does not
represent an actual physical temperature like die or case temperature.
Instead, it specifies the processor temperature relative to the point at
which the system must supply the maximum cooling for the processor's
specified maximum case temperature and maximum thermal power dissipation"
according to BIOS and Kernel Developer's Guide (BKDG) for AMD Processors,
http://developer.amd.com/resources/developer-guides-manuals/.
FreeBSD 14.1-RELEASE-p8 September 5, 2017 FreeBSD 14.1-RELEASE-p8