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tools/power turbostat: use tsc_tweak everwhere it is needed 

The CPU ticks at a rate in the "bus clock" domain.
eg. 100 MHz * bus_ratio.

On newer processors, the TSC has been moved out of this BCLK
domain and into a separate crystal-clock domain.

While the TSC ticks "close to" the base frequency, those that look
closely at the numbers will notice small errors in calculations that
mix units of TSC clocks and bus clocks.

"tsc_tweak" was introduced to address the most visible
mixing -- the %Busy and the the Busy_MHz calculations.
(A simplification as since removed TSC from the BusyMHz calculation)

Here we apply the tsc_tweak to everyplace where BCLK
and TSC units are mixed.  The results is that
on a system which is 100% idle, the sum of the C-states
are now much more likely to be closer to 100%.

Reported-by: Travis Downs <travis.downs@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2017-02-10 00:29:51 -05:00
parent 96e4715857
commit 008d396eb2
1 changed files with 25 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
tools/power/x86/turbostat/turbostat.c
View File

@ -680,7 +680,7 @@ int dump_counters(struct thread_data *t, struct core_data *c,
int format_counters(struct thread_data *t, struct core_data *c,
struct pkg_data *p)
{
double interval_float;
double interval_float, tsc;
char *fmt8;
int i;
struct msr_counter *mp;
@ -695,6 +695,8 @@ int format_counters(struct thread_data *t, struct core_data *c,
interval_float = tv_delta.tv_sec + tv_delta.tv_usec/1000000.0;
tsc = t->tsc * tsc_tweak;
/* topo columns, print blanks on 1st (average) line */
if (t == &average.threads) {
if (DO_BIC(BIC_Package))
@ -725,14 +727,14 @@ int format_counters(struct thread_data *t, struct core_data *c,
1.0 / units * t->aperf / interval_float);
if (DO_BIC(BIC_Busy))
outp += sprintf(outp, "\t%.2f", 100.0 * t->mperf/t->tsc/tsc_tweak);
outp += sprintf(outp, "\t%.2f", 100.0 * t->mperf/tsc);
if (DO_BIC(BIC_Bzy_MHz)) {
if (has_base_hz)
outp += sprintf(outp, "\t%.0f", base_hz / units * t->aperf / t->mperf);
else
outp += sprintf(outp, "\t%.0f",
1.0 * t->tsc / units * t->aperf / t->mperf / interval_float);
tsc / units * t->aperf / t->mperf / interval_float);
}
if (DO_BIC(BIC_TSC_MHz))
@ -748,7 +750,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
/* C1 */
if (DO_BIC(BIC_CPU_c1))
outp += sprintf(outp, "\t%.2f", 100.0 * t->c1/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * t->c1/tsc);
/* Added counters */
for (i = 0, mp = sys.tp; mp; i++, mp = mp->next) {
@ -760,7 +762,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
} else if (mp->format == FORMAT_DELTA) {
outp += sprintf(outp, "\t%lld", t->counter[i]);
} else if (mp->format == FORMAT_PERCENT) {
outp += sprintf(outp, "\t%.2f", 100.0 * t->counter[i]/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * t->counter[i]/tsc);
}
}
@ -769,15 +771,15 @@ int format_counters(struct thread_data *t, struct core_data *c,
goto done;
if (DO_BIC(BIC_CPU_c3) && !do_slm_cstates && !do_knl_cstates)
outp += sprintf(outp, "\t%.2f", 100.0 * c->c3/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * c->c3/tsc);
if (DO_BIC(BIC_CPU_c6))
outp += sprintf(outp, "\t%.2f", 100.0 * c->c6/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * c->c6/tsc);
if (DO_BIC(BIC_CPU_c7))
outp += sprintf(outp, "\t%.2f", 100.0 * c->c7/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * c->c7/tsc);
/* Mod%c6 */
if (DO_BIC(BIC_Mod_c6))
outp += sprintf(outp, "\t%.2f", 100.0 * c->mc6_us / t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * c->mc6_us / tsc);
if (DO_BIC(BIC_CoreTmp))
outp += sprintf(outp, "\t%d", c->core_temp_c);
@ -791,7 +793,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
} else if (mp->format == FORMAT_DELTA) {
outp += sprintf(outp, "\t%lld", c->counter[i]);
} else if (mp->format == FORMAT_PERCENT) {
outp += sprintf(outp, "\t%.2f", 100.0 * c->counter[i]/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * c->counter[i]/tsc);
}
}
@ -819,24 +821,24 @@ int format_counters(struct thread_data *t, struct core_data *c,
/* Totl%C0, Any%C0 GFX%C0 CPUGFX% */
if (do_skl_residency) {
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_wtd_core_c0/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_any_core_c0/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_any_gfxe_c0/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_both_core_gfxe_c0/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_wtd_core_c0/tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_any_core_c0/tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_any_gfxe_c0/tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pkg_both_core_gfxe_c0/tsc);
}
if (do_pc2)
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc2/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc2/tsc);
if (do_pc3)
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc3/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc3/tsc);
if (do_pc6)
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc6/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc6/tsc);
if (do_pc7)
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc7/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc7/tsc);
if (do_c8_c9_c10) {
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc8/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc9/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc10/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc8/tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc9/tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->pc10/tsc);
}
/*
@ -878,7 +880,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
} else if (mp->format == FORMAT_DELTA) {
outp += sprintf(outp, "\t%lld", p->counter[i]);
} else if (mp->format == FORMAT_PERCENT) {
outp += sprintf(outp, "\t%.2f", 100.0 * p->counter[i]/t->tsc);
outp += sprintf(outp, "\t%.2f", 100.0 * p->counter[i]/tsc);
}
}
@ -1048,7 +1050,7 @@ delta_thread(struct thread_data *new, struct thread_data *old,
old->c1 = 0;
else {
/* normal case, derive c1 */
old->c1 = old->tsc - old->mperf - core_delta->c3
old->c1 = (old->tsc * tsc_tweak) - old->mperf - core_delta->c3
- core_delta->c6 - core_delta->c7;
}
}