October 24, 2019   |   by admin

Hotplug CPU is also supported. Which power metrics specific to your workload are you looking for? Measuring only one CPU per socket is sufficient. Alexey, I was trying to get the measurements for core power – PP0 preferably or at least package power. That is, read the energy values and from that calculate the power. The first thing I noticed between the two CPUs is the power planes for which the energy numbers are reported. In general usage, this is still better to respect this setting by the manufacturer, this may be more optimal for battery management and avoid overheat as their cooling system is not built for the full TDP.

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A simple and useful tool is powerstat.

Under Windows, there is the possibility to use Intel XTU to set these power limits to the wanted values. Set power limit to Intel rapl Ask Question.

Measuring only one CPU per socket is sufficient. Log in to post comments. I will try to update the kernel to 4.

It however displays as if the limits where 17 and 21 W, whereas the same tool doesn’t show consumed ibtel over 10W shows 9 in fact. This driver makes use of two power limit, the short term power limit, that allows higher power for short term thanks to inertia and the long term power limit, the average power, the processor dissipates when operating at Base Ihtel with all cores active, also known as TDP.


There is no privilege level filtering either. It said that “rdmsr: For more complete information about compiler optimizations, see our Optimization Notice. By using our inntel, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Home Questions Tags Users Unanswered.

Set power limit to Intel rapl – Unix & Linux Stack Exchange

I had first to replace the rapl. Hotplug CPU is also supported. It has a specific module that uses powercap to read energy consumption. There is the possibility to play on the P-Statesbut I didn’t found the way to increase this small 10W limit I monitor the power consumed by the CPU. That helps track ingel and is sufficient given that RAPL events do not support any filters, i.

Skip to main content. Any insights into why I see these strange numbers for Skylake-X would be greatly appreciated.

Here is some info about the two systems I am reading the measurements on. Leave a Comment Please sign in to add a comment.

perf,x86: add Intel RAPL PMU support

I couldn’t find any official documentation on this topic maybe I wasn’t looking in the right place. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of servicefapl policy and cookie policyand that your continued use of the website is subject to these policies.


Thank you for the answers.

Be sure the module is loaded. But in some cases, you have power plugged in I use a 90W power supply instead of the original 45Wand you have additional cooling capabilities that makes some room for the temperature. I’m not quite sure, but perf has its own structure to read rapl counters. Still a very low reading in energy and power.

It is an ubuntu project, but you can easily compile it and use in you linux distribution i use it on Arch. After that, the tool needs root privilege to run.

Understanding Intel’s RAPL Driver On Linux – Phoronix

But when I tried to get the power through Inel interface, one problem happened. Listing paramaters for package 0 DRAM: MSRs can be read in write in kernel mode, so you must use a module to handle them. It is a kernel module of Linux. Email Required, but never shown.