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Subject[PATCH] Added multiplier for APERF and MPERF counters
Date
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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