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Computational Energy Cost of TCP CS294-14 Paper Discussion Fall 2007

This paper discusses the measurement and breakdown of energy consumption in TCP over wireless networks. The study examines the energy costs of TCP processing and offers techniques for reducing energy usage, such as zero-copy methods and utilizing more powerful NICs. The results show significant potential energy savings of 20-30%. The paper also contributes energy reduction techniques, TCP energy models, and methods for simulating and measuring energy costs in NS-2 simulations.

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Computational Energy Cost of TCP CS294-14 Paper Discussion Fall 2007

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  1. Computational Energy Cost of TCPCS294-14 Paper Discussion Fall 2007 2007-10-17 Yanpei Chen

  2. Paper Overview • To measure energy of TCP over wireless • Energy given by current drawn through multimeters • Platforms running TCP during measurement • TCP run on laptop w/ FreeBSD 4.2 & 5 (TCP reno & newreno) • iPAQ (TCP reno) • Results • Kernel-NIC copy is costly: 60-70% energy • User-kernel copy cost 15% energy • TCP processing 15% energy – can be further broken down • Suggested energy reduction techniques • Zero-copy: Data from user space directly to NIC • More powerful NIC to reduce kernel-NIC copy cost • Save 20-30% energy

  3. Related Work • Most energy work done on wireless interface, channel environment etc. • Past work on TCP computational cost focus on time consumed • One past work on TCP energy – consumption not broken down • Contributions of the paper • Help develop energy reduction techniques • Develop TCP energy models • Allow NS-2 to simulate energy cost • Present energy measurement method … to be reused …

  4. Methodology • Instrumentation • Arithmetic • Graphical illustration

  5. Results • Average total energy • TCP vs. Radio • Comparison against time metric • Breaking down TCP energy cost

  6. Results – Breaking down TCP processing cost • Check sum cost by running check sum code • TO, TD, ACK cost in lossy network • Validate results by predicting energy use for 10MB of data

  7. Energy reduction techniques • Zero-copy: Data from user buffers directly to NIC • Function exists in FreeBSD 5 • More powerful NIC to reduce kernel-NIC copy cost • Keep TCP send buffer on NIC • Maximize data transfer chunk from kernel to NIC • Save 20-30% energy

  8. Questions • Have their work made its way into NS-2? • Similar work on wired topology?

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