Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH] Added multiplier for APERF and MPERF counters | Date | Thu, 17 Sep 2015 19:04:56 +0200 |
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On Wednesday, September 16, 2015 02:52:18 PM Lukasz Anaczkowski wrote: > From: Hubert Chrzaniuk <hubert.chrzaniuk@intel.com> > > Intel(R) Xeon Phi x200 (KNL) increments APERF/MPERF every > 1024 clocks, which is different than other Intel architectures > (incremented every single clock). > It results in understated values for %Busy and Avg_MHz values, > thus multiplier for APERF/MPERF counters. > > Signed-off-by: Hubert Chrzaniuk <hubert.chrzaniuk@intel.com> > Signed-off-by: Lukasz Anaczkowski <lukasz.anaczkowski@intel.com>
Please *always* send PM-related patches to linux-pm@vger.kernel.org (CCed now).
> --- > tools/power/x86/turbostat/turbostat.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c > index 9655cb4..1dda607 100644 > --- a/tools/power/x86/turbostat/turbostat.c > +++ b/tools/power/x86/turbostat/turbostat.c > @@ -71,6 +71,7 @@ unsigned int extra_msr_offset32; > unsigned int extra_msr_offset64; > unsigned int extra_delta_offset32; > unsigned int extra_delta_offset64; > +unsigned int aperf_mperf_multiplier = 1; > int do_smi; > double bclk; > unsigned int show_pkg; > @@ -984,6 +985,8 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p) > return -3; > if (get_msr(cpu, MSR_IA32_MPERF, &t->mperf)) > return -4; > + t->aperf = t->aperf * aperf_mperf_multiplier; > + t->mperf = t->mperf * aperf_mperf_multiplier; > } > > if (do_smi) { > @@ -2543,6 +2546,13 @@ int is_knl(unsigned int family, unsigned int model) > return 0; > } > > +unsigned int get_aperf_mperf_multiplier(unsigned int family, unsigned int model) > +{ > + if (is_knl(family, model)) > + return 1024; > + return 1; > +} > + > #define SLM_BCLK_FREQS 5 > double slm_freq_table[SLM_BCLK_FREQS] = { 83.3, 100.0, 133.3, 116.7, 80.0}; > > @@ -2744,6 +2754,9 @@ void process_cpuid() > } > } > > + if (has_aperf) > + aperf_mperf_multiplier = get_aperf_mperf_multiplier(family, model); > + > do_nhm_platform_info = do_nhm_cstates = do_smi = probe_nhm_msrs(family, model); > do_snb_cstates = has_snb_msrs(family, model); > do_pc2 = do_snb_cstates && (pkg_cstate_limit >= PCL__2); >
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.
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