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131 lines
3.6 KiB
131 lines
3.6 KiB
Kernel driver fam15h_power |
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========================== |
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Supported chips: |
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* AMD Family 15h Processors |
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* AMD Family 16h Processors |
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Prefix: 'fam15h_power' |
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Addresses scanned: PCI space |
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Datasheets: |
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- BIOS and Kernel Developer's Guide (BKDG) For AMD Family 15h Processors |
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- BIOS and Kernel Developer's Guide (BKDG) For AMD Family 16h Processors |
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- AMD64 Architecture Programmer's Manual Volume 2: System Programming |
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Author: Andreas Herrmann <[email protected]> |
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Description |
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----------- |
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1) Processor TDP (Thermal design power) |
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Given a fixed frequency and voltage, the power consumption of a |
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processor varies based on the workload being executed. Derated power |
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is the power consumed when running a specific application. Thermal |
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design power (TDP) is an example of derated power. |
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This driver permits reading of registers providing power information |
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of AMD Family 15h and 16h processors via TDP algorithm. |
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For AMD Family 15h and 16h processors the following power values can |
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be calculated using different processor northbridge function |
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registers: |
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* BasePwrWatts: |
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Specifies in watts the maximum amount of power |
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consumed by the processor for NB and logic external to the core. |
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* ProcessorPwrWatts: |
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Specifies in watts the maximum amount of power |
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the processor can support. |
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* CurrPwrWatts: |
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Specifies in watts the current amount of power being |
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consumed by the processor. |
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This driver provides ProcessorPwrWatts and CurrPwrWatts: |
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* power1_crit (ProcessorPwrWatts) |
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* power1_input (CurrPwrWatts) |
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On multi-node processors the calculated value is for the entire |
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package and not for a single node. Thus the driver creates sysfs |
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attributes only for internal node0 of a multi-node processor. |
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2) Accumulated Power Mechanism |
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This driver also introduces an algorithm that should be used to |
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calculate the average power consumed by a processor during a |
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measurement interval Tm. The feature of accumulated power mechanism is |
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indicated by CPUID Fn8000_0007_EDX[12]. |
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* Tsample: |
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compute unit power accumulator sample period |
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* Tref: |
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the PTSC counter period |
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* PTSC: |
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performance timestamp counter |
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* N: |
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the ratio of compute unit power accumulator sample period to the |
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PTSC period |
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* Jmax: |
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max compute unit accumulated power which is indicated by |
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MaxCpuSwPwrAcc MSR C001007b |
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* Jx/Jy: |
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compute unit accumulated power which is indicated by |
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CpuSwPwrAcc MSR C001007a |
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* Tx/Ty: |
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the value of performance timestamp counter which is indicated |
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by CU_PTSC MSR C0010280 |
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* PwrCPUave: |
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CPU average power |
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i. Determine the ratio of Tsample to Tref by executing CPUID Fn8000_0007. |
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N = value of CPUID Fn8000_0007_ECX[CpuPwrSampleTimeRatio[15:0]]. |
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ii. Read the full range of the cumulative energy value from the new |
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MSR MaxCpuSwPwrAcc. |
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Jmax = value returned. |
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iii. At time x, SW reads CpuSwPwrAcc MSR and samples the PTSC. |
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Jx = value read from CpuSwPwrAcc and Tx = value read from PTSC. |
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iv. At time y, SW reads CpuSwPwrAcc MSR and samples the PTSC. |
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Jy = value read from CpuSwPwrAcc and Ty = value read from PTSC. |
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v. Calculate the average power consumption for a compute unit over |
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time period (y-x). Unit of result is uWatt:: |
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if (Jy < Jx) // Rollover has occurred |
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Jdelta = (Jy + Jmax) - Jx |
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else |
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Jdelta = Jy - Jx |
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PwrCPUave = N * Jdelta * 1000 / (Ty - Tx) |
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This driver provides PwrCPUave and interval(default is 10 millisecond |
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and maximum is 1 second): |
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* power1_average (PwrCPUave) |
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* power1_average_interval (Interval) |
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The power1_average_interval can be updated at /etc/sensors3.conf file |
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as below: |
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chip `fam15h_power-*` |
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set power1_average_interval 0.01 |
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Then save it with "sensors -s".
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