Hi all,
Below are raw power data on Hikey board; with this power data i'd like to
create the power model for Hikey.
- Measure method:
On Hikey board, we cannot measure buck1 which is dedicated for AP
subsystem; so turned to measure VDD_4V2 to remove R247 and remount
shunt resistor 470mOhm. At a result, the power data includes many
other LDO's power data.
+--------------+ +-------------+
4.2v | | Buck1 | |
---- Shunt Resistor --->| PMIC: Hi6553 |------>| SoC: Hi6220 |
^ ^ | | | ACPU |
| | +--------------+ +-------------+
|-> Energy Probe <-|
- Measured raw data:
sys_suspend: AP system suspend state
cluster_off: two clusters are powered off
cluster_on: 1 cluster is powered on, all cpus are powered off
cpu_wfi: 1 cluster is powered on, last cpu enters 'wfi' but other cpus
are powered off
voltage: voltage for every OPP
# OPP sys_suspend cluster_off cluster_on cpu_wfi cpu_on voltage
208 328 347 366 374 435 1.04
432 328 344 374 388 499 1.04
729 331 351 400 409 606 1.09
960 329 353 430 443 750 1.18
1200 331 365 486 506 988 1.33
Hikey Power Model
Power [mW]
500 ++--------+-------------+---------+---------++ cluster_off **A***
+ + + + D cluster_on ##B###
450 ++.........................................%%+ cpu_wfi $$C$$$
400 ++.......................................%%.++ cpu p-state %%D%%%
| : : : %% |
350 ++...................................%%.....++
| : : :%% |
300 ++...............................%D.........++
250 ++...........................%%%%...........++
| : : %%% : |
200 ++....................%%D%..................++
| : %%%%% : : |
150 ++...........%%%%...........................++
| %%D%% : : #####B
100 ++.%%%%%.....................#####B#####....++
50 D%%..............#######B####...............++
A*********A*************A*********A**********A
0 C$$$$$$$$$C$$$$$$$$$$$$$C$$$$$$$$$C$$$$$----++
208 432 729 960 1200
Frequency [MHz]
Hikey Power Efficiency
Power Efficiency [mW/MHz] Voltage [v]
0.45 ++-------+----------+--------+-------++ 3 Cluster Power **A***
+ + + + + CPU Static Power ##B###
0.4 ++...................................$C CPU Dynamic power $$C$$$
| : : : $$$++ 2.5 Voltage %%D%%%
0.35 ++.............................$$$...++
| : : $$C$ |
0.3 C$$$$$$$$..............$$$$..........++ 2
| C$$$$$$$$$$C$$ : |
0.25 ++...................................++ 1.5
0.2 ++................................%%%%D
| : : %%%%D%%%% |
0.15 D%%%%%%%%D%%%%%%%%%%D%%%%............++ 1
| : : : |
0.1 A********.........................****A
| A**********A********A**** ++ 0.5
0.05 ++...................................++
B########B##########+ ####B########B
0 ++-------+----------B####----+-------++ 0
208 432 729 960 1200
Frequency [MHz]
- Power Model On Hikey:
According to before we have discussed for power model, i think below is the
prefered power data for Hikey which calculated from raw power date:
static struct idle_state idle_states_cluster_a53[] = {
{ .power = 0 },
{ .power = 0 },
};
/*
* Use (cluster_on - cluster_off) for every OPP
*/
static struct capacity_state cap_states_cluster_a53[] = {
/* Power per cluster */
{ .cap = 178, .power = 19, },
{ .cap = 369, .power = 30, },
{ .cap = 622, .power = 49, },
{ .cap = 819, .power = 77, },
{ .cap = 1024, .power = 121, },
};
/*
* Use (cpu_wfi - cluster_on) for every OPP, then calculate the
* average value for wfi's power data; But we can see actually
* the idle state of "WFI" will be impacted by voltage.
*/
static struct idle_state idle_states_core_a53[] = {
{ .power = 12 },
{ .power = 0 },
};
/*
* Use (cpu_on - cluster_off) for every OPP
*/
static struct capacity_state cap_states_core_a53[] = {
/* Power per cpu */
{ .cap = 178, .power = 69, }, /* 208MHz */
{ .cap = 369, .power = 125, }, /* 432MHz */
{ .cap = 622, .power = 206, }, /* 729MHz */
{ .cap = 819, .power = 320, }, /* 960MHz */
{ .cap = 1024, .power = 502, }, /* 1.2GHz */
};
If have any questions or issues for upper energy model data, please let me know;
Appreciate review and comments in advance.
- Some other questions
Q1: Jian & Dan, voltage for 1.2GHz is quite high, could you help check
the voltage table for OPPs, if there have any unexpected value?
Q2: Morten, if i want to do more profiling on EAS, do you suggest i should
refer which branch now? I think now EASv5 patches are relative old,
so want to check if we have better candidate or not.
i downloaded the git repo: git://www.linux-arm.org/linux-power.git, branch
energy_model_rfc_v5.1; but there have no sched-dvfs related patches.
Thanks,
Leo Yan
I see there is a jank measurement capability in workload automation:
http://pythonhosted.org/wlauto/_modules/wlauto/instrumentation/fps.html
Has anyone used this? Limitations, prerequisites etc? I'd like to use this to measure janks during scrolls. I'll give it a shot but I've never used WA before so I thought I'd check first if anyone had comments/experiences to share.
thanks,
Steve
