Re: [Powertop] Does PowerTop support MHz numbers for Intel Xeon L5410 CPUs ?

On (07/07/14 08:25), Arjan van de Ven wrote: >> not sure that powertop performs any specific MSRs at all, since most of MSRs are >> called correspondingly to c-state flags (has_cXXX), e.g. >> >> __init: >> if (model == 0x45 || model ==0x3D) >> has_c8c9c10_res = 1; >> >> >> >> and later: >> >> if (has_c8c9c10_res) { >> c8_before = get_msr(number, MSR_PKG_C8_RESIDENCY); >> c9_before = get_msr(number, MSR_PKG_C9_RESIDENCY); >> c10_before = get_msr(number, MSR_PKG_C10_RESIDENCY); >> } >> >> and so on. > > > but if the set is empty, you don't get any data, and the "emulation" side of powertop > is likely a better choice... since there are C states, just not counters. > looks like powertop checks C6 state `get_msr(number, MSR_PKG_C6_RESIDENCY)' in start and end measurement for any intel cpu, along with `get_msr(first_cpu, MSR_TSC)'. anyway, need to investigate. the output that Valentin sees is rather strange, saying that cpu0 is 138% Idle. CPU 0 Idle 138% CPU 2 Idle 111,7% CPU 1 Idle 111,7% CPU 3 Idle 111,7% -ss