Messages in this thread Patch in this message | | | From | Lukasz Anaczkowski <> | Subject | [PATCH] Added multiplier for APERF and MPERF counters | Date | Wed, 16 Sep 2015 14:52:18 +0200 |
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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> --- 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); -- 1.8.3.1
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