On Thu, 26 Mar 2015, Jacob Pan wrote: > RAPL energy hardware unit can vary within a single CPU package, e.g. > HSW server DRAM has a fixed energy unit of 15.3 uJ (2^-16) whereas > the unit on other domains can be enumerated from power unit MSR. > There might be other variations in the future, this patch adds > per cpu model quirk to allow special handling of certain cpus.
So I have a Desktop Haswell machine (model 60) that is instrumented to measure actual DRAM power at the DIMM (with a sense resistor). We are consistently getting RAPL results roughly a factor of 2 smaller than the actual, measured results. Does desktop Haswell have a similar units issue to Haswell-EP? I wasted a bunch of time trying to decode the DRAM_ENERGY_SCALEFACTOR_MCHBAR values described in the Desktop 4th Generation Intel Core Processor Family datasheet but possibly that value in the MCHBAR is unrelated to the one exported by the RAPL interface. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
