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AMD Posts Accumulated Power Reporting Support For Linux

Written by Michael Larabel in AMD on 7 January 2016 at 07:06 AM EST. Add A Comment

New patches have been posted by an AMD engineer for exposing accumulated power reporting.

This set of patches would calculate the average power consumption for the processor and expose it via the perf subsystem as a new performance counter as well as hwmon. Compared to the Family 15h power driver published long ago that just tries to tell how much power the CPU is actively using (though in all my tests, it was never close to accurate on the hardware I've tried), this accumulated power reporting would calculate the average power consumed during a specified measurement interval.

This accumulated power mechanism is supported in the hardware on Family 15h Model 60 CPUs (Carrizo, I believe) and newer.

More details on these tentative patches for AMD accumulated power reporting for the Linux kernel can be found via the patch series.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.