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Network Performance Advisor

Network Performance Advisor. Tanya M. Brethour NLANR/DAST. Network Performance Advisor. Measures, displays, and analyzes network metrics Uses existing diagnostic tools: ping, traceroute, Iperf, and Web100 integrates them into a common framework

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Network Performance Advisor

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  1. Network Performance Advisor Tanya M. Brethour NLANR/DAST Joint Techs – Columbus, OH

  2. Network Performance Advisor Measures, displays, and analyzes network metrics • Uses existing diagnostic tools: • ping, traceroute, Iperf, and Web100 • integrates them into a common framework • Attempts to emulate a junior-level network engineer: • Allows users to troubleshoot their own networking problems • Advises users on course of action, including “do nothing—your network performance is as good as possible” • Additional tools and analyses are simple to add Joint Techs – Columbus, OH

  3. Overview • Performance Data Collector (PDC) • Gathers network performance data • Performance Data Historical Archiver (PDHA) • Archives network performance data • Analysis Engine • Analyzes network data • Provide plain text advice to solve problems or increase performance • GUI • Expert Interface: table & tree of metrics • Map Interface: graphical display of network • Analysis Interface: interact with Analysis Engine • All components written in Java and use XML-RPC Joint Techs – Columbus, OH

  4. Performance Data Collector • Designed to be stand-alone, extensible, and portable • Elegantly handles platform differences and unavailability of any given measurement • Overview of Features in Alpha 1.0 Release: • Uses bundles to facilitate integration of performance data measurement tools • A collection of scripts or Java classes that describe: • How to invoke a measurement tool • What metrics the measurement tool measures • How to parse the measurement tool's output • Implements an XML-RPC interface • getAllMetrics: returns the list of metrics that may be measured • getMeasurement, getMeasurements, getAllMeasurements: returns an individual, a list, or all measurements given a remote host Joint Techs – Columbus, OH

  5. PDC Features • Overview of Features in Alpha 1.0 Release: • All requests are fulfilled immediately without any caching • Activation • Allows cooperation of both ends through a mechanism called activation (i.e. for tools such as Iperf) • Security • Using SSL and username/password (more to come) • Autoupdating • Periodically updates the bundles (automatically) • User can set how often to check for updates • All system bundles updated • Tool to update bundles on demand Joint Techs – Columbus, OH

  6. PDC Features • Alpha 1.1 Release Features (July 2004) • NMWG Response Schema • Full Java class support for reading and writing in the schema • Bundle support for NMWG Response Schema • Several bug fixes • Future development of PDC • Using the request and discovery schemas • Report cost of metrics • Adding bundles • Investigate moving from RPC/literal to fully document/literal Joint Techs – Columbus, OH

  7. Performance Data Historical Archiver • Short to medium-term storage of PDC measurements • Initial Release Features: • Act as a caching proxy for the PDC • Utilizes an XML-RPC interface to retrieve data • Clients can retrieve old measurement results and the latest measurement results • Clients can force PDHA to request new measurements from PDC • To retrieve archived measurements specify an • interval: returns all measurements taken during the specified interval • list of timestamps: returns all measurements that match a timestamp in the list, with some amount of error allowed. • Allow different performance measurements to have different "lifetimes“ • Stores data on disk in XML file Joint Techs – Columbus, OH

  8. PDHA • Initial release September 2004 • Includes all features mentioned • Future Development: • Allow customization of how often, and how much historical performance data is stored and ways to manage this data. • Allow the retrieval of historical data by date and time from third party databases Joint Techs – Columbus, OH

  9. Analysis Engine • Analyze the metrics for a specific end-to-end path and give advice to solve any performance or connectivity problems • Features: • “Test Definition Files” (TDFs) similar to PDC’s ADFs • Redesigned! • TDFs consist of • detection Rules • synthetic metrics file • problem descriptions, and solutions • Synthetic Metrics • binary Operations on metrics • may be written in any scripting language (and eventually Java) • Constructs decision trees to efficiently determine problems Joint Techs – Columbus, OH

  10. Analysis Engine • Current Status • Currently writing a set of Test Definition Files for initial release. • Example TDFS include: Duplex mismatch, incorrect buffer sizes, incorrect settings, congestion, general connectivity issues. • Initial public release September 2004 • Future Development: • More TDFs (design of the TDFs will continue to evolve) • Sort trees by updated cost and probability • Relate TDFs to each other • Modify AE to use historical data • Engage the network engineering community to obtain more analysis test cases Joint Techs – Columbus, OH

  11. Advisor GUI • Three main graphical displays • Expert GUI: Displays all metrics • uses a tree to organize metrics • uses a table to display metrics and corresponding information • Analysis GUI: Displays advice reported from the analysis engine • simple text display • Map GUI: Visually display of the network and trouble spots • users will be able to click on the map to view measurements for specific areas along the path Joint Techs – Columbus, OH

  12. Advisor GUI • Current Status: • Expert GUI alpha version complete and released • Has been updated for display NMWG schema additional information. • Simple Analysis Engine GUI completed (will be revised for September release) • No development work on Map GUI at this time. Joint Techs – Columbus, OH

  13. Releases • Summary of release schedule • July 2004: Alpha 1.1 release • Includes NMWG response schema and other changes • September 2004: Alpha 1.2 release • Focus on fixes to the AE and PDHA since their initial release • Additional tests added to the Analysis Engine Joint Techs – Columbus, OH

  14. Join us! • We need your help! • Join our mailing list (advisor-users) • Download the 1.1 release at the end of the month or the 1.2 release at the end of August. • Write bundles for your favorite network diagnostic tools • Submit bug reports • Write TDFs and stress our new design • Tell us what we are doing right or wrong! • http://dast.nlanr.net/projects/advisor Joint Techs – Columbus, OH

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