HWP_MOSTEFFICIENT_PERF
(unsigned int)HWP_GUARANTEED_PERF(msr), (unsigned int)HWP_MOSTEFFICIENT_PERF(msr), (unsigned int)HWP_LOWEST_PERF(msr));
cap->efficient = msr_perf_2_ratio(HWP_MOSTEFFICIENT_PERF(msr));