Hw 4 power consumption

1. Power consumption
HW-4
TEAM CSIE
陳顥文 P76034305

2. Requirement
• 針對以下幾種components 在不同state下的耗電量進行實測，
• components: WiFi chipset, Cellular Radio, Bluetooth, GPS, Display,
CPU。
• change states (OFF/ON, idle/full power, low/high brightness, etc.),
• https://source.android.com/devices/tech/power.html#screen-power
• 請利用表格呈現測量結果，並附上每個測試的command及步驟為
何。
• 作業請於下下次上課4/9號前，上傳到moodle。

3. Device
• Sony Z Ultra C6833 LTE version with official 4.4.4 ROM
• 2.20GHz Qualcomm Snapdragon 800
• Elpida LPDDR2 RAM
• 6.4” 1080*1920
• Daily use applications load and run.

4. Implement
• Problem1:
• TA gives link which using getLongProperty Methods and
BATTERY_PROPERTY_CURRENT_NOW are not support before API 21
• Solve1:
• Direct to read system file,
• # cat /sys/class/power_supply/battery/current_now
• Value unit is Nano Amp.
• Different Model may have different file path.
http://stackoverflow.com/questions/2439619/getting-the-battery-current-values-for-the-android-phone

5. Measure App – Global current
• CurrentWidget: Battery Monitor
• https://play.google.com/store/apps/details?id=com.manor.currentwidget
• 3 Second record current_now
• 10 times(a half min)

6. CPU test

7. Measure App – CPU test
• CPU-Z
• Make sure every core speed.
• Antutu CPU Master
• Adjust core speed.
• In Air plant Mode.
• Turn off monitor.

8. CPU – Prevent/Allow suspend test
• Disable suspend.
• # echo temporary > /sys/power/wake_lock
• Enable suspend.
• # echo temporary > /sys/power/wake_unlock

9. CPU – Prevent/Allow suspend test
-22
-27
-24 -25 -26
-20
-15
-36
-26
-15
-4 -5 -4 -4
-49
-4 -4 -4 -5 -5
-60
-50
-40
-30
-20
-10
0
CPU No/Have suspend test
CPU no suspend CPU suspend
No suspend Avg: -23.6mA
Suspend Avg: -8.8mA

10. CPU – Available frequency

11. CPU – Max frequency
• echo userspace >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
• echo 2150400>
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
• echo 2150400 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
• echo 2150400 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

12. CPU – Max frequency
• Using Antutu CPU Master.
• Fix CPU frequency to 2150.4Mhz.
• Chose Performance mode.

13. CPU – Max utility
• Using loop.
• while true; do true; done
• Using multiple Terminal to control CPU Usage
core.

14. CPU – Monitor real frequency
• CPU-Z to make sure CPU utility status &
frequency.

15. CPU – CPU Core power consumption test
-422 -370 -375
-562
-425 -396 -366 -373 -400 -366
-698
-595 -568 -592 -595 -567 -568
-790
-570 -571
-812 -811 -810 -813 -818 -817 -816 -814 -825 -808
-964
-1129 -1155
-936
-825
-989
-1056
-1150 -1097
-829
-1400
-1200
-1000
-800
-600
-400
-200
0
CPU @ 2.15Ghz with different core test
CPU 2.15G 1CORE CPU 2.15G 2CORE CPU 2.15G 3 CORE CPU 2.15G Full load
1 Core: -405.5mA 2 Core: -611.4mA
3 Core: -814.4mA 4 Core: -1013mA

16. Monitor

17. Monitor
• Disable Auto brightness control.
• Test min/max backlit.
• Set backlit at Android build-in setting interface.
• Set CPU Frequency to min(300Mhz), ondemand mode.
• Using Google Calendar App.
• Turn off monitor.

18. Monitor – Backlit consumption test
-215 -216 -215 -209 -208 -213 -211 -210 -211 -212
-499 -505 -485 -484 -486 -483 -484 -478
-520 -485
-800
-700
-600
-500
-400
-300
-200
-100
0
1 2 3 4 5 6 7 8 9 10
Monitor backlit test
Min backlit Max backlit
Min backlit: -212mA
Max backlit: -490.9mA

19. WiFi

20. WiFi
• Inherit monitor test setting.
• Open monitor, min backlit.

21. WiFi – Scan &
Disconnect
• Using WiFi analyzer to
stay scanning.
• Using Network Signal
Info Pro to see signal
strength.
• Stay at Google
Calendar App.

22. WiFi – Scan & Disconnect
-248
-622
-439 -466
-520
-249 -248 -290
-247 -247-207 -210 -227
-398
-841
-667
-219 -236 -216 -218
-1000
-800
-600
-400
-200
0
WiFi Scan&Disconnect test
Scan Disconnect
Scan: -357.6mA
Disconnect: -343.9mA

23. WiFi – Connected & Active
• Using SpeedTest App to test.
• Connect @ 802.11n mode @ 72Mbps.
• Still stay in Google Calendar App due to
render Speedtest App is consumption
more power.
• Test twice, 8.21/6.01 and 28.99/7.62
are similar power consumption.

24. WiFi – Connected IDLE & Active test
-214 -214 -212 -211
-271
-222 -213 -234 -223 -261
-630
-423 -407
-260
-469
-857
-780
-691
-278 -260
-1000
-800
-600
-400
-200
0
1 2 3 4 5 6 7 8 9 10
WiFi Connected IDLE/Active test
Connected - IDLE Connected - Active
Connected – IDLE: -227.5mA
Connected – Active: -505.5mA

25. WiFi – Connected Active test
with iPerf test1
• To get high speed and power consumption
test.
• Avg test result: 18.5Mbit/s
• Stay in iPerf Apps. (may consumption more
power due to refresh monitor)

26. WiFi – Connected Active test with iPerf
-862
-710
-638 -610
-392
-570
-699
-781
-655
-791
-1000
-800
-600
-400
-200
0
Connected - Active with Iperf
Connected – Active with Iperf: -670.8mA

27. Bluetooth

28. Bluetooth – BT 2.0 & BT 4.0
• Inherit monitor test setting.
• Connect Creative T3150 BT 2.0 speaker.
• Connect Motorola 360 BT 4.0 SmartWatch.
• Stay in Google Calendar App.

29. Bluetooth – BT 2.0 & BT 4.0 test
-248
-233
-256
-241
-207 -216 -208
-235 -235
-261
-209 -213 -218 -211
-256
-217
-234
-213 -215 -211
-225 -227 -232
-275
-237 -235
-264
-224
-240 -235
-300
-250
-200
-150
-100
-50
0
1 2 3 4 5 6 7 8 9 10
BT Test
Disconnect Connect to BT 2.0 Connect to BT 4.0
Disconnect: -234mA
Connect to BT 2.0: -219.7mA
Connect to BT 4.0: -239.4mA

30. Cellular

31. Cellular
• Inherit monitor test setting.
• ISP: CHT
• Using Speedtest App to Active Cellular.
• Stay in Google Calendar App.

32. Cellular
• Using Network Signal Pro
to check signal status.

33. Cellular – HSPA+ & LTE
-217 -215 -216 -255 -234 -241 -212 -214
-293
-210-246 -212
-276 -283 -298 -274 -273
-221
-311
-246
-643
-578
-526
-617
-540 -556 -526 -558
-328
-281
-216 -249
-331
-209 -232 -225 -217 -217
-282
-335
-273
-457
-596
-718
-415
-302
-364
-506
-798
-515
-1000
-800
-600
-400
-200
0
1 2 3 4 5 6 7 8 9 10
Cellular test
Without MobileData HSPA+ HSPA+ Active LTE LTE Active
Without MobileData: -230.7mA
HSPA+: -264mA HSPA+ Active: -515.3mA
LTE: -251.3mA LTE Active: -494.4mA

34. GPS
• Inherit monitor test setting.
• Using “GPS狀態” App.
• Stay in GPS狀態 App.
• This app active light and Gyro and
Magnetic field sensor together,
consumption value may Inaccurate.

35. GPS – Locating & Located
-254
-585 -562
-787 -762
-582-550
-403
-239
-887
-547
-490
-787
-654
-545
-490
-1000
-800
-600
-400
-200
0
GPS test
GPS Locating GPS Located
GPS Locating: -588.667mA
GPS Located: -559.2mA

36. -1200
-1000
-800
-600
-400
-200
0
Total Avg

37. About this slide
• Author: Nathaniel Chen @ NCKU
• ar801112usase@hotmail.com
• Last update:2015/04/19 1702 v1.4