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Web100 and Logistical Networking

Learn about Web100 components, TCP Autotuning, software distribution, IETF standards, Userland Library & GUI, and why it's vital for logistical networks to embrace these technologies. Email support@web100.org for questions.

nathaniel-angelo
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Web100 and Logistical Networking

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  1. Web100 and Logistical Networking Jim Ferguson I2 Members Meeting April 10, 2003

  2. Outline • What is Web100? • Web100 Diagnostic Tools • Web100 Distribution (www.web100.org) • Remember this is about Logistical Networking • Web100 userland Library

  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

  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. Why on Logistical Networks? • Autotuned, fast TCP for data transfers. • Allows quick diagnosis of TCP anomolies via access to TCP statistics. • Autotuned, fast TCP for data transfers.

  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 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)

  14. 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

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

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