Historical Documents

Berlin (CeroWrt 3.8) Builds

Berlin is the code name for the Cerowrt 3.8 (3.9?) build which is currently (May 2013) under development.

Modena (CeroWrt 3.7) Builds

Modena is the code name for the current CeroWrt 3.7.5-2 build, created in February 2013. You can read about it at the main Wiki page.

Sugarland (CeroWrt 3.3) Builds

Sugarland (CeroWrt 3.3.8-26) was released on 18 Sep 2012, and is the first release to include CoDel code. It is listed here only for the historical record, since the the Modena (3.7) builds incorporate all its features and offer significantly improved performance.

BQL builds

The bql-smoketest builds provided a good improvement to the buffer bloat problem from November 2011 through February 2012. However, all their major improvements have been implemented in the Linux 3.3 kernel. You can read the BQL series release notes. bql-smoketests: http://huchra.bufferbloat.net/~cero1/bql-smoketests/


About the OCEAN CITY release. In the latter half of 2011, we had hoped to release a build with grand goals. This release was to be named OCEAN CITY. But reality set in, and it became obvious that we could not meet these goals. The rc6 build is the culmination of the Ocean City release. Download the stable release: http://huchra.bufferbloat.net/~cero1/cerowrt-wndr3700-1.0rc6/

Any remaining references to an Ocean City on these pages are being changed to align with the more important goals set out above. The OCEAN CITY page lists obsolete information.

Other documents

The following may be incomplete or outdated.

Architecture Notes


Building CeroWrt on your own machine

Using the CeroWrt test tools

Packages developed during Bismark boot camp



Test Labs

BloatLab 1 (isc.org)




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Bufferbloat Related Projects

OpenWrt Project
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Flent Network Test Suite
The Cake shaper
CeroWrt (where it all started)

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".