On Wednesday, September 16, 2015 02:52:18 PM Lukasz Anaczkowski wrote:
> From: Hubert Chrzaniuk <hubert.chrzan...@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.chrzan...@intel.com>
> Signed-off-by: Lukasz Anaczkowski <lukasz.anaczkow...@intel.com>
Please *always* send PM-related patches to linux...@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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