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Web100 Roll Out

Web100 Roll Out. I2 Members Meeting April 9-11, 2003. Agenda. Web100 History Web100 Diagnostic Tools Web100 Applications and User Experience. The Web100 Project. When there is a problem, just ask TCP TCP has an ideal vantage point Can identify the bottleneck subsystem

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Web100 Roll Out

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  1. Web100 Roll Out I2 Members Meeting April 9-11, 2003

  2. Agenda • Web100 History • Web100 Diagnostic Tools • Web100 Applications and User Experience

  3. The Web100 Project • When there is a problem, just ask TCP • TCP has an ideal vantage point • Can identify the bottleneck subsystem • Already measures the network • Can measure the application • Can adjust itself

  4. Web100 Components • Kernel Instrument Set (KIS) • Diagnostic Tools • Autotuning • Widely distributed Open Source • TCP ESTATS MIB • Promote vendor adoption

  5. Diagnostic Tools • User mode tools to prove core functionality • Template for future tool developers • KIS validation • Portable library to hide OS details

  6. TCP Autotuning • Supercedes today’s controls for experts • Eliminate primary cause of the wizard gap. • New TCP buffer management model. • TCP just gets it right without controls. • Paper in draft for future publication.

  7. Software Distribution • Open source • Linux kernel patches • User mode Tools • Contributed Software • Active user/developer support by the Web100 team • User group meetings

  8. IETF Standards • TCP extended statistics MIB • Adds detailed per connection statistics • Standard TCP instruments and controls • Most recent draft submitted early March • TSV WG work item • Key vendors are already participating

  9. Kernel Instrument Set (KIS) • TCP Instruments prototyped in Linux 2.4. • Simple API via /proc. • Instrument groups: • Options and State • IP Traffic and Throughput • Triage • Congestion Events • Network Path properties • TCP API Usage • TCP Parameters • WAD Parameters

  10. Web100 Userland 1.3 • Library: allows application developers to easily integrate Web100 support • Command-line tools: provide simple, scriptable access to Web100 variables • GUI: a user-friendly front-end to the Web100 variables • Includes a comprehensive set of man pages, a developer’s guide, and a user’s guide

  11. Userland Library • Provides useful abstraction and common inter-application functionality • Base abstraction is the agent (from SNMP terminology). Other abstractions include the group, variable, and connection. • Includes taking snapshots and generating log files

  12. Userland Library Cont’d • Will handle different operating systems’ methods for exposing Web100 variables (Linux’s /proc vs. BSD’s sysctl(3)) • Userland 2.0’s library’s programming interface will change, but old applications will not break as 1.3 and 2.0 may coexist on the same computer

  13. Userland Library Users • Web100 command-line and GUI tools • Web100-based Iperf: http://www-didc.lbl.gov/~jason/net100/ • Web100 Python interface: http://www.web100.org/download/contributed/web100py • Others?

  14. Userland Command-line Tools • readall: reads the current value of all Web100 variables from all connections • readvar: read the current value of a single Web100 variable from one connection • deltavar: continuously monitor a single Web100 variable in a single connection, displaying how it changes every second • writevar: write a value to a single Web100 variable in one connection (for tunable variables only)

  15. Userland GUI • Access, display, and control (where applicable) values of Web100 variables • List connections and related process info • Triage pie chart shows the source of congestion: Sender, Receiver, Path • Uses GTK2/GTK1 (common to all standard Linux distributions)

  16. Userland GUI Cont’d • Display: • continually list values of all variables • graph those of interest • triage analysis per connection • Control: • toggle auto-tuning per connection • set tunable variables: LimCwnd, LimRwin

  17. Userland Wrap-up • Feel free to email support@web100.org with any questions or problems with the userland • Feature and improvement suggestions welcome!

  18. Applied Web100 – One Example • Larry Dunn teaches a basic network class at U.Minnesota using Web100. • Students study local- and wide-area TCP flows by inspecting variables exposed by Web100. • Wide-area experiments done to a Web100 enabled machine at NCSA (UIUC). • Class taught Spring 2002, and is being repeated now.

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