Click to edit Master title style

• Click to edit Master text styles– Second level

• Third level– Fourth level

» Fifth level

1

List of Nominations List of Nominations

What’s GoodWhat’s Wished For

Peter O’Neil

Poneil@ucar.edu

August 2, 2002

Click to edit Master title style

• Click to edit Master text styles– Second level

• Third level– Fourth level

» Fifth level

2

List of Nominations List of Nominations

What’s Good• tracking loss, RTT, throughput, modifying streams and window size• clearing up guesswork by adding specific information• clarifies bottlenecks and performance problems• tcp oscilliscope to guide tuning problems one by one as veils removed• shows small receiver sockets, % packet loss, and degree of difficulty with throughput• tune hosts to support SACK, pMTUd, timestamps, and window scaling, send and receive window

buffers• test and prove OS stacks behaving properly given parameters set• effective diagnostic tool, tuning guide, and good for closing wizard gap• teaching tool for displaying network behavior and BW*Delay effects• diagnostic tool for network signatures for "typical“ network problems and suggests changes/fixes to

improve performance• provides results from experimenting with various tuning options and comparing results (experimental

transport tool framework for testing actual behavior on networks rather than just testing on simulators)• dx firewall effects, out-of-order packets, path capacity,caching, queuing, BW*D, buffer limits, wscale

clamps,loss intensity, bottlenecks, recovery, timeouts,

Click to edit Master title style

• Click to edit Master text styles– Second level

• Third level– Fourth level

» Fifth level

3

List of Nominations List of Nominations

Wish List

• netBSD port• OS vendor involvement particularly AIX and Solaris• iperf mods to use web100 to identify when slow start finished and report

throughput• dynamically select CID• highlight interesting results from mib variables and produce text

summary/recommendations• streams and window prediction• point out where in the network problem lies• receiver side stats• analyze what from WAD can/should go into kernel• web100 trace file capability• variable for count of duplicate data segments at receiver• remove wscale restriction

Click to edit Master title style

• Click to edit Master text styles– Second level

• Third level– Fourth level

» Fifth level

4

List of Nominations List of Nominations Thank You!