Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver k8temp 2 ==================== 3 4 Supported chips: 5 * AMD Athlon64/FX or Opteron CPUs 6 Prefix: 'k8temp' 7 Addresses scanned: PCI space 8 Datasheet: http://support.amd.com/us/Processor_TechDocs/32559.pdf 9 10 Author: Rudolf Marek 11 Contact: Rudolf Marek <r.marek@assembler.cz> 12 13 Description 14 ----------- 15 16 This driver permits reading temperature sensor(s) embedded inside AMD K8 17 family CPUs (Athlon64/FX, Opteron). Official documentation says that it works 18 from revision F of K8 core, but in fact it seems to be implemented for all 19 revisions of K8 except the first two revisions (SH-B0 and SH-B3). 20 21 Please note that you will need at least lm-sensors 2.10.1 for proper userspace 22 support. 23 24 There can be up to four temperature sensors inside single CPU. The driver 25 will auto-detect the sensors and will display only temperatures from 26 implemented sensors. 27 28 Mapping of /sys files is as follows: 29 30 temp1_input - temperature of Core 0 and "place" 0 31 temp2_input - temperature of Core 0 and "place" 1 32 temp3_input - temperature of Core 1 and "place" 0 33 temp4_input - temperature of Core 1 and "place" 1 34 35 Temperatures are measured in degrees Celsius and measurement resolution is 36 1 degree C. It is expected that future CPU will have better resolution. The 37 temperature is updated once a second. Valid temperatures are from -49 to 38 206 degrees C. 39 40 Temperature known as TCaseMax was specified for processors up to revision E. 41 This temperature is defined as temperature between heat-spreader and CPU 42 case, so the internal CPU temperature supplied by this driver can be higher. 43 There is no easy way how to measure the temperature which will correlate 44 with TCaseMax temperature. 45 46 For newer revisions of CPU (rev F, socket AM2) there is a mathematically 47 computed temperature called TControl, which must be lower than TControlMax. 48 49 The relationship is following: 50 51 temp1_input - TjOffset*2 < TControlMax, 52 53 TjOffset is not yet exported by the driver, TControlMax is usually 54 70 degrees C. The rule of the thumb -> CPU temperature should not cross 55 60 degrees C too much.