[Cerowrt-devel] collecting some data?

Dave Taht dave.taht at gmail.com
Mon Feb 25 15:13:15 EST 2013

I have been collecting statistics on the behavior of the 3.7.5-2 version of
cerowrt, and perhaps y'all out there can help. I've been doing four
repeatable tests.

I feed the attached file into the chrome web page benchmark and run it 4

1) No other load on the system
2) while running a single up and single down netperf stream to icei.org (on
the east coast)
3) then while still loaded, after turning on simple_qos.sh, set for ~85% of
the rated up/down bandwidth...
4) then killing the load, and keeping simple_qos enabled.

I export each detailed (you have to select it) .csv output from that
benchmark to a file.

I do it against a bidirectional stream - one each of

netperf -l 6000 -4 -H icei.org -t TCP_MAERTS &
netperf -l 6000 -4 -H icei.org -t TCP_STREAM &

(if you have ipv6, more power to you, kill the -4. )

then starting the web tests 10-20 seconds later. It's interesting to watch
cero's bandwidth graphs while doing this.

There are netperf servers setup on the east (icei.org) and west coast (
snapon.lab.bufferbloat.net) and a few other places. It would be sane to
setup your own someplace you control (from netperf's svn compiled with
--enable-demo), as it helps to have a shorter RTT to truly load up the
link. You can also run the rrul test (preferably for 5 minutes or more
because this test idea KILLs web page load times) to get a heavier load and
more graphs.

If you are up to trying this test series, please let me know, send along
the details of your setup, and the 4 csv files, and perhaps your data will
show up in an upcoming paper.

The chrome web page benchmark can be had at:


And requires you fire off chrome with --enable-benchmarking

You can use the version of netperf on cerowrt to generate the load if you
like, but rrul doesn't run on that. Latest version of rrul is at

Dave Täht

Fixing bufferbloat with cerowrt:
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