The outline of topics we’d like to address more fully is below:

Demonstration recipes for demonstrating/testing for bufferbloat

  • Servers
  • Home routers
  • Wifi routers
  • Wifi clients
  • Ethernet
  • Broadband gear
  • Core internet
  • 3G wireless


  • Set end-node transmit buffers to something sane
  • Set QOS knobs on routers to keep broadband gear’s buffer from filling.

Full Solutions

  • Fixes for routers involve AQM of some sort - Van’s modified RED (or similar) is really necessary in wireless situations, as classic RED isn’t easily dynamic, though one could kludge it, of course
  • Proper solutions for end-nodes involve some intelligence in buffering; at a minimum control of transmit buffers and device rings.

Testing tools

Needed tools

  • a “push here to make your network become loaded” test, to drive this home to people
  • a tool like pingplotter for Linux and Mac (at least), to help identify bloated links. This might be an elaboration of mtr: that works properly.
  • For super, duper extra bonus points, a tool that uses the techniques of reverse traceroute to identify problems on the reverse path, since many/most paths in the Internet are asymmetric





Historical data/papers of interest

Test equipment

Dave Taht’s to-do list:

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Bufferbloat Mailing Lists
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Archived Bufferbloat pages from the Wayback Machine


Comcast Research Innovation Fund
Nlnet Foundation
Shuttleworth Foundation

Bufferbloat Related Projects

Congestion Control Blog
Lede Project (OpenWrt)
Flent Network Test Suite
The Cake shaper

Network Performance Related Resources

Jim Gettys' Blog - The chairman of the Fjord
Toke's Blog - Karlstad University's work on bloat
Voip Users Conference - Weekly Videoconference mostly about voip
Candelatech - A wifi testing company that "gets it".