Abstract
The purpose of this work was to obtain a component-wise breakdown of the power consumption a modern laptop. We measured the power usage of the key components in an IBM ThinkPad R40 laptop using an Agilent Oscilloscope and current probes. We obtained the power consumption for the CPU, optical drive, hard disk, display, graphics card, memory, and wireless card subsystems–either through direct measurement or subtractive measurement and calculation. Moreover, we measured the power consumption of each component for a variety of workloads. We found that total system power consumption varies a lot (8 W to 30 W) depending on the workload, and moreover that the distribution of power consumption among the components varies even more widely. We also found that though power saving techniques such as DVS can reduce CPU power considerably, the total system power is still dominated by CPU power in the case of CPU intensive workloads. The display is the other main source of power consumption in a laptop; it dominates when the CPU is idle. We also found that reducing the backlight brightness can reduce the system power significantly, more than any other display power saving techniques. Finally, we observed OS differences in the power consumption.
An erratum to this chapter can be found at http://dx.doi.org/10.1007/11574859_13 .
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References
Yuan, W., Nahrstedt, K.: Energy-Efficient Soft Real-Time CPU Scheduling for Mobile Multimedia Systems. In: SOSP 2003 (2003)
Lebeck, A.R., Fan, X., Zeng, H., Ellis, C.: Power Aware Page Allocation. In: ASPLOS 2000 (2000)
Weissel, A., Beutel, B., Bellosa, F.: Cooperative I/O - A Novel I/O Semantics for Energy-Aware Applications. In: OSDI 2002 (2002)
Chinn, G., Desai, S., DiStefano, E., Ravichandran, K., Thakkar, S.: Mobile PC Platforms Enabled with Intel® Centrino, Intel Technology Journal (May 2003)
Lorch, J.: A complete picture of the energy consumption of a portable computer, Masters Thesis, Computer Science, University of California at Berkeley (December 1995)
Cignetti, T., Komarov, K., Ellis, C.: Energy Estimation Tools for the Palm, ACM Modeling, Analysis and Simulation of Wireless and Mobile Systems (2000)
Flinn, J., Farkas, K.I., Anderson, J.: Power and Energy Characterization of the Itsy Pocket Computer (Version 1.5), Compaq Western Research Laboratory, Technical Note TN-56 (February 2000)
Infineon, 256-Mbit DDR SDRAM datasheet (January 2003)
IBM Mobile Systems, ThinkPad Computer Hardware Maintenance Manual (March 2003)
Gatti, F., Acquaviva, A., Benini, L., Ricco, B.: Low Power Control Techniques For TFT LCD Displays, CASES (2002)
Intel 855 GME chipset mobile computers, http://developer.intel.com/design/chipsets/mobile/855GME.htm
Intel Low Power Technologies: Bringing Longer Battery Life and Higher Productivity to Mobile Computing, http://www.intel.com/ebusiness/pdf/prod/related_mobile/wp021601.pdf
Intel Pentium M datasheet, http://www.intel.com/design/mobile/datashts/25261203.pdf
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© 2005 Springer-Verlag Berlin Heidelberg
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Mahesri, A., Vardhan, V. (2005). Power Consumption Breakdown on a Modern Laptop. In: Falsafi, B., VijayKumar, T.N. (eds) Power-Aware Computer Systems. PACS 2004. Lecture Notes in Computer Science, vol 3471. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11574859_12
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DOI: https://doi.org/10.1007/11574859_12
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