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pchar: Child of pathchar

pchar: Child of pathchar. (from notes on presentation by Bruce Mah) Alan Verlo, EVL. pathchar. Developed by Van Jacobsen, LBL (1997) Determine per-hop network path characteristics: Bandwidth, propagation delay, queue time, drop rate

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pchar: Child of pathchar

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  1. pchar: Child of pathchar (from notes on presentation by Bruce Mah) Alan Verlo, EVL

  2. pathchar • Developed by Van Jacobsen, LBL (1997) • Determine per-hop network path characteristics: • Bandwidth, propagation delay, queue time, drop rate • Sends series of packets with random payload sizes over time to each hop in a path to determine bandwidth • Attempts to assess real-world network conditions • Alpha version (1997) is most current release • Slides of algorithms used:ftp.ee.lbl.gov/pathchar/msri-talk.tar.gz

  3. pchar • Developed by Bruce Mah (Sandia, CA) <bmah@ca.sandia.gov> • Independent implementation • Varies IP ttl to control how far into network the packets go, gives links traversed • Vary packet sizes (bandwidth & latency) • Many repetitions (loss & queuing) • 32 packets for each packet size, about 40 sizes • 1400 packets total for each hop

  4. pchar • Minimums of each packet size for each hop may give characteristics of each hop w/o queuing delay • Space between min and max curves may show characteristics between hops

  5. pchar • To get: www.ca.sandia.gov/~bmah/Software/pchar • FreeBSD, Solaris, Linux, Irix

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