Intel rapl domain psys issues

mwest — Tue, 21 Nov 2023 08:33:33 GMT

Hi,

We have several custom machines based on the following chip: https://www.adlinktech.com/Products/Download.ashx?type=MDownload&isDatasheet=yes&file=1895%5ccExpress-TL-datasheet-20230516.pdf
They are all using a COM Express Carrier Board from ConnectTech and running a Linux OS built by Yocto based on the meta-intel BSP package.

However some machines are reporting the following:

dmesg | grep rapl intel_rapl_msr: PL4 support detected. intel_rapl_common: Found RAPL domain package intel_rapl_common: Found RAPL domain core intel_rapl_common: Found RAPL domain uncore intel_rapl_common: Found RAPL domain psys

While others are reporting this:

dmesg | grep rapl intel_rapl_msr: PL4 support detected. intel_rapl_common: Found RAPL domain package intel_rapl_common: Found RAPL domain core intel_rapl_common: Found RAPL domain uncore

They are all based on the exact same SOC from AdLink, with the exact same carrier board and running the exact same Linux OS. We have looked into the bios settings and can see no difference there either.

For the devices that have the psys domain we also see that the we can not read any of the measurements, i.e we get the following:

/sys/devices/virtual/powercap/intel-rapl/intel-rapl:1# cat constraint_0_max_power_uw cat: read error: No data available

So my question is what can cause the fact that some machines are reporting finding the RAPL psys domain and some not?

topic Intel rapl domain psys issues in Software Tuning, Performance Optimization & Platform Monitoring

Intel rapl domain psys issues