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tools/power turbostat: correct DRAM RAPL units on recent Xeon processors 

While not yet documented in the Software Developer's Manual,
the data-sheet for modern Xeon states that DRAM RAPL ENERGY units
are fixed at 15.3 uJ, rather than being discovered via MSR.

Before this patch, DRAM energy on these products is over-stated by turbostat
because the RAPL units are 4x larger.

ref: "Xeon E5-2600 v3/E5-1600 v3 Datasheet Volume 2"
http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/xeon-e5-v3-datasheet-vol-2.pdf

Signed-off-by: Andrey Semin <andrey.semin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Andrey Semin 2014-12-05 00:07:00 -05:00 committed by Len Brown
parent 0b2bb6925e
commit 40ee8e3b9d
1 changed files with 25 additions and 3 deletions
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28
tools/power/x86/turbostat/turbostat.c
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@ -83,7 +83,8 @@ unsigned int do_dts;
unsigned int do_ptm;
unsigned int tcc_activation_temp;
unsigned int tcc_activation_temp_override;
double rapl_power_units, rapl_energy_units, rapl_time_units;
double rapl_power_units, rapl_time_units;
double rapl_dram_energy_units, rapl_energy_units;
double rapl_joule_counter_range;
unsigned int do_core_perf_limit_reasons;
unsigned int do_gfx_perf_limit_reasons;
@ -600,7 +601,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
if (do_rapl & RAPL_GFX)
outp += sprintf(outp, fmt8, p->energy_gfx * rapl_energy_units / interval_float);
if (do_rapl & RAPL_DRAM)
outp += sprintf(outp, fmt8, p->energy_dram * rapl_energy_units / interval_float);
outp += sprintf(outp, fmt8, p->energy_dram * rapl_dram_energy_units / interval_float);
if (do_rapl & RAPL_PKG_PERF_STATUS)
outp += sprintf(outp, fmt8, 100.0 * p->rapl_pkg_perf_status * rapl_time_units / interval_float);
if (do_rapl & RAPL_DRAM_PERF_STATUS)
@ -617,7 +618,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
p->energy_gfx * rapl_energy_units);
if (do_rapl & RAPL_DRAM)
outp += sprintf(outp, fmt8,
p->energy_dram * rapl_energy_units);
p->energy_dram * rapl_dram_energy_units);
if (do_rapl & RAPL_PKG_PERF_STATUS)
outp += sprintf(outp, fmt8, 100.0 * p->rapl_pkg_perf_status * rapl_time_units / interval_float);
if (do_rapl & RAPL_DRAM_PERF_STATUS)
@ -1935,6 +1936,25 @@ double get_tdp(model)
}
}
/*
* rapl_dram_energy_units_probe()
* Energy units are either hard-coded, or come from RAPL Energy Unit MSR.
*/
static double
rapl_dram_energy_units_probe(int model, double rapl_energy_units)
{
/* only called for genuine_intel, family 6 */
switch (model) {
case 0x3F: /* HSX */
case 0x4F: /* BDX */
case 0x56: /* BDX-DE */
return (rapl_dram_energy_units = 15.3 / 1000000);
default:
return (rapl_energy_units);
}
}
/*
* rapl_probe()
@ -1994,6 +2014,8 @@ void rapl_probe(unsigned int family, unsigned int model)
else
rapl_energy_units = 1.0 / (1 << (msr >> 8 & 0x1F));
rapl_dram_energy_units = rapl_dram_energy_units_probe(model, rapl_energy_units);
time_unit = msr >> 16 & 0xF;
if (time_unit == 0)
time_unit = 0xA;