< SIGs | PowerManagement
RHEL 5 x Fedora 12
This is the first power consumption comparison of RHEL 5 and Fedora 12 (incoming RHEL 6). The results was measured by BLTK that gets power consumption data from laptop's battery info. There were used three workloads for this comparison:
- Idle - simulates no interaction from user side (no screen saver defined)
- Office - simulates working in Open Office with breaks
- Reader - simulates reading text in Firefox
Hardware
LENOVO ThinkPad T61
- CPU Intel Core2 Duo CPU T7500 2.20 GHz
- Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller
- LCD 15" 1680x1050x24
- Memory 2 GB
- HDD 100 GB
- Battery designed and usable capacity 56.16 Wh
RHEL 5
Kernel release 2.6.18-164.el5
Fedora 12
Kernel release 2.6.31-33.fc12.x86_64
Test description
The tests was done on the laptop installed with RHEL 5, Fedora 11 and Fedora 12 using shared /home. The workload mentioned above was used with following specification:
Idle test - test started for 10 minutes
bltk -I -T 600
Office test - Open Office workload started with three repetitions (work simulation repeated 3x)
bltk -O -n 3
Reader test - test uses Firefox as a reader application (by default in bltk.conf). Each of test run has been called with three repetitions
bltk -R -n 3
Result tables
Results in charts
Wifi Power consumption
The test aimed at wifi power consumption. BLTK have been used to measure raw power consumption of connected wifi but without real data transmission. The laptop described below is installed with Fedora 11.
Hardware
LENOVO ThinkPad T61
- CPU Intel Core2 Duo CPU T7100 1.8 GHz
- Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller
- LCD 14" 1440x900x24
- 2 GB of memory
- HDD Hitachi 100 GB
- Battery designed capacity 56.16 Wh / usable capacity 40.96 Wh
Test description
The test was done using BLTK and its Office workload. The were used three use cases
- wifi on - the laptop was near to the AP. Signal strength almost 100%.
- wifi of
- wifi on - the laptop was on another floor as the AP. Signal strength ~ 50%.
The office workload has been repeated four times:
bltk -O -n 4
Measurement was done three times for all use cases.
RHEL 5
| Timer | Irq | Load | Timer | Irq | Load | Rd | Wr | Act | StnBy | Slp | B-Cap | Chrg % | E-Cap | Chrg % | Drain | Bat life |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 997.43 | 0.24 | 10.73 | 0 | 63.84 | 11.78 | 9.47 | 11.62 | 100 | 0 | 0 | 56160 | 100 | 55540 | 98.89 | 19.24 | 175 |
| 998.06 | 0.16 | 5.68 | 0 | 46.37 | 9.59 | 0 | 9.01 | 100 | 0 | 0 | 55540 | 98.89 | 54950 | 97.84 | 21.03 | 160 |
| 998.17 | 0.19 | 6.79 | 0 | 45.98 | 7.59 | 0 | 9.64 | 100 | 0 | 0 | 54940 | 97.82 | 54360 | 96.79 | 20.88 | 161 |
| 1003.51 | 0.2 | 7.38 | 0 | 61.37 | 11.12 | 9.66 | 10.17 | 100 | 0 | 0 | 52820 | 94.05 | 52200 | 92.94 | 20.86 | 161 |
| 1004.98 | 0.2 | 8.1 | 0 | 48.38 | 7.02 | 0 | 8.29 | 100 | 0 | 0 | 52200 | 92.94 | 51580 | 91.84 | 22.32 | 150 |
| 997.03 | 0.21 | 7.86 | 0 | 48.06 | 6.76 | 0 | 8.28 | 100 | 0 | 0 | 51580 | 91.84 | 50990 | 90.79 | 21.24 | 158 |
Fedora 12
| Timer | Irq | Load | Timer | Irq | Load | Rd | Wr | Act | StnBy | Slp | B-Cap | Chrg % | E-Cap | Chrg % | Drain | Bat life |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 301.19 | 65.69 | 13.45 | 303.94 | 72.75 | 13.88 | 0.03 | 3.16 | 100 | 0 | 0 | 56080 | 99.85 | 55490 | 98.8 | 20.23 | 166 |
| 310.11 | 42.88 | 14.09 | 291.02 | 73.3 | 10.86 | 0 | 2.95 | 100 | 0 | 0 | 55470 | 98.77 | 54910 | 97.77 | 19.38 | 173 |
| 325.22 | 43.5 | 12.51 | 338.85 | 80.57 | 15.15 | 0.01 | 3.74 | 100 | 0 | 0 | 54890 | 97.73 | 54320 | 96.72 | 19.92 | 169 |
| 312.94 | 43.51 | 14.47 | 306.45 | 66.66 | 13.48 | 0 | 3.39 | 100 | 0 | 0 | 27500 | 48.96 | 26830 | 47.77 | 22.97 | 146 |
| 280.32 | 45.93 | 9.69 | 310.83 | 75.95 | 15.23 | 0 | 3.33 | 100 | 0 | 0 | 26780 | 47.68 | 26110 | 46.49 | 23.19 | 145 |
| 288.66 | 41.61 | 10.36 | 309.44 | 69.88 | 14.23 | 0 | 2.81 | 100 | 0 | 0 | 26080 | 46.43 | 25410 | 45.24 | 23.19 | 145 |
Results and charts
TBD