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Chapter 3

Chapter 3. Performance Measurement of TCP/IP Networks. Objectives. Appreciate the role of measurement in building and maintaining high-performance TCP/IP networks Explain the types of tools available for performance measurement

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Chapter 3

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  1. Chapter 3 Performance Measurement of TCP/IP Networks

  2. Objectives • Appreciate the role of measurement in building and maintaining high-performance TCP/IP networks • Explain the types of tools available for performance measurement • Familiarize with freely available performance measurement and testing tools • Select an appropriate tool for a given task

  3. Contents • Why network measurement • Measurement tasks • Classification of measurement tools • Practical measurement tools • Selecting the right tool

  4. Why Network Measurement

  5. Why Network Measurement • Network management • Monitor performance (e.g. performance bottleneck) • Improve network services • Network traffic analysis • Characterize traffic load • Input for network design

  6. Why Network Measurement (Cont.) • Network research • Collect packet traces • Traffic modeling • Validate TCP model • Protocol implementation • Inspect packet header • Identify packet payload • Debug

  7. Measurement Tasks

  8. Measurement Tasks • Data collection: Collect raw data from operational network • Analysis: Obtain traffic characteristics (e.g. avg. throughput, delay, etc.) • Presentation: Visualize network performance • Interpretation: Ultimate goal of measurement tasks

  9. Tool Classification

  10. Classification of Measurement Tools • Depending on purposes of measurement • Monitoring tools (e.g. Tcpdump, tcpstat) • Benchmarking tools (e.g. ttcp, NetPerf, etc.) • Fig 3.1

  11. Classification of Measurement Tools (Cont.) • Depending on level of tasks • Collector • Analyzer • Depending on implementation • Software tools • Hardware tools

  12. Measurement Tools

  13. Practical Measurement Tools • Tcpdump • Tcpstat • Netperf • NetPIPE • DBS (Distributed Benchmark System

  14. Tcpdump • Capture header/payload information • Implemented on Unix platform • libpcap: Capture and filter packets • tcpdump: Analyze packet structure

  15. Tcpstat • Report TCP related statistics periodically • Bandwidth used • No. of packets exchanged • Avg packet size • libpcap: Capture and filter packets • tcpstat: Count packets • Invoked with superuser privilege

  16. Producing Traffic Statistics Graphs

  17. No. of ARP, TCP,UDP packets ps

  18. Throughput and load of the observed traffic

  19. Ttcp • Measure TCP throughput • TCP • UDP • Installation

  20. Performance measurement with ttcp

  21. Netperf • Active testing tool (benchmarking) • Measure available bandwidth between two nodes • Major features: • Generate different traffic patterns • Bulk data transfer (e.g. FTP) • Interactive data exchange (e.g. rlogin) • Detailed and precise measurement • Besides TCP/UDP, also support datalink and other network protocols

  22. Netperf (Cont.) • Fig. 3.15

  23. NetPIPE • Benchmarking tool • Application-oriented • Determine optimal message size • Observe congestion level with a particular message size • Protocols supported: • TCP • MPI • RPC • AAL5

  24. NetPIPE (Cont.) • Fig. 3.17

  25. Gnuplot Graph using NetPIPE output data

  26. DBS(Distributed Benchmark System) • Measure performance of multiple TCP connections in parallel • Support sophisticated test traffic patterns • Evaluation of other important aspects of TCP • Retransmission control • Congestion avoidance control • Usage

  27. DBS (Cont.) • Fig. 3.20

  28. Throughput

  29. Sequence No

  30. Delay

  31. Delay in Detail

  32. Comparison • Table 3.9 • All six tools are compared against 10 different features

  33. Selecting Right Tool

  34. Selecting the Right Tool • Things need to be considered • Measurement capability • Platform supported • Measurement objective • Availability • Refer to Tables 3.9 and 3.10

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