Messages in this thread | | | Date | Mon, 30 Oct 2023 11:11:42 +0800 | Subject | Re: [PATCH] tools/power turbostat: Fix Bzy_MHz calculation equation | From | Peng Liu <> |
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Ping
On 2023/10/7 13:46, Peng Liu wrote: > From: Peng Liu <liupeng17@lenovo.com> > > To calculate Bzy_MHz, TSC_delta should multiply APERF_delta instead > of dividing it. > > Signed-off-by: Peng Liu <liupeng17@lenovo.com> > --- > tools/power/x86/turbostat/turbostat.8 | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8 > index 8f08c3fd498d..1ba6340d3b3d 100644 > --- a/tools/power/x86/turbostat/turbostat.8 > +++ b/tools/power/x86/turbostat/turbostat.8 > @@ -370,7 +370,7 @@ below the processor's base frequency. > > Busy% = MPERF_delta/TSC_delta > > -Bzy_MHz = TSC_delta/APERF_delta/MPERF_delta/measurement_interval > +Bzy_MHz = TSC_delta*APERF_delta/MPERF_delta/measurement_interval > > Note that these calculations depend on TSC_delta, so they > are not reliable during intervals when TSC_MHz is not running at the base frequency.
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