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62 lines
2.1 KiB
62 lines
2.1 KiB
Kernel driver k8temp |
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==================== |
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Supported chips: |
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* AMD Athlon64/FX or Opteron CPUs |
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Prefix: 'k8temp' |
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Addresses scanned: PCI space |
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Datasheet: https://www.amd.com/system/files/TechDocs/32559.pdf |
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Author: Rudolf Marek |
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Contact: Rudolf Marek <[email protected]> |
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Description |
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----------- |
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This driver permits reading temperature sensor(s) embedded inside AMD K8 |
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family CPUs (Athlon64/FX, Opteron). Official documentation says that it works |
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from revision F of K8 core, but in fact it seems to be implemented for all |
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revisions of K8 except the first two revisions (SH-B0 and SH-B3). |
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Please note that you will need at least lm-sensors 2.10.1 for proper userspace |
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support. |
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There can be up to four temperature sensors inside single CPU. The driver |
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will auto-detect the sensors and will display only temperatures from |
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implemented sensors. |
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Mapping of /sys files is as follows: |
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============= =================================== |
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temp1_input temperature of Core 0 and "place" 0 |
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temp2_input temperature of Core 0 and "place" 1 |
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temp3_input temperature of Core 1 and "place" 0 |
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temp4_input temperature of Core 1 and "place" 1 |
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============= =================================== |
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Temperatures are measured in degrees Celsius and measurement resolution is |
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1 degree C. It is expected that future CPU will have better resolution. The |
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temperature is updated once a second. Valid temperatures are from -49 to |
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206 degrees C. |
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Temperature known as TCaseMax was specified for processors up to revision E. |
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This temperature is defined as temperature between heat-spreader and CPU |
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case, so the internal CPU temperature supplied by this driver can be higher. |
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There is no easy way how to measure the temperature which will correlate |
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with TCaseMax temperature. |
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For newer revisions of CPU (rev F, socket AM2) there is a mathematically |
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computed temperature called TControl, which must be lower than TControlMax. |
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The relationship is following: |
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temp1_input - TjOffset*2 < TControlMax, |
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TjOffset is not yet exported by the driver, TControlMax is usually |
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70 degrees C. The rule of the thumb -> CPU temperature should not cross |
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60 degrees C too much.
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