[Codel] Cerowrt 3.3.8-6 is now available

Dave Taht dave.taht at gmail.com
Tue Jun 19 13:31:48 EDT 2012

I just put out http://huchra.bufferbloat.net/~cero1/3.3/3.3.8-6/ and
deployed it as my default gw and ran a bunch of tests that it
survived. I'd prefer to test 24 hours but I'm about to start a trip
and can't do that. Hopefully after some more testers leap on it we can
declare it stable later this week and move on...

Also the source tree is mostly pushed out but a bit of a mess, I don't
know if I'll be able to get Cero independently
buildable any time soon.


+ update to linux 3.3.8
+ Fix for bind9 CVE
+ switch to netifd
+ a complete resync with openwrt - this includes much new stuff,
including wireless-testing - way too many updates to talk about
without pulling in the commit log
+ memory problem with ath9k appears gone
+ ECN dropping instituted under load
+ fq_codel packet limits
+ There is now 6rd support, totally untested and unconfigured;
+ transmission bittorrent is in there, too
+ fq_codel on all interfaces by default, on wireless using all 4 subqueues

I really hope this will be a stable enough release for more people to
try as their main router.

-s on this release: I went for "stable" rather than new features after
it cost me too much time

- I had to rip out opkg signing support, and some ipv6/diffserv
classification support in transmission that wasn't fully baked.

- re-running simple_qos.sh with new values appears to require a reboot first

-The default gui for AQM doesn't work, the one for "qos" uses hfsc +
fq_codel (but lacks ipv6 and diffserv support), and the command line
simple_qos.sh has ipv6 and diffserv, but has to be edited and run
manually. And perhaps it's use of htb etc can be improved. I get
pretty good results on comcast with simple_qos, see speedtest results


but not *quite* as good as I hoped for. However, under heavier loads
the fq_codel stuff is working great under netperf with various numbers
of threads and classifications and users.

I would hope some folk here run some benchmarks against various things
but some cautions - for example - chrome's benchmark tends to hit dns
hard, and cero by default is not using your most local forwarder so it
can bottleneck on dns - ways to fix that if you have dnssec is to edit
forwarders.conf to point to your local forwarder,
and uncomment the forwarders line in named.conf. If your ISP doesn't
do dnssec yet, disable dnssec and point forwarders.conf to their
nameservers - but I otherwise am getting

Also: I would really prefer people clearly identify when they are
testing over wireless vs ethernet and until you have a fq_codel and
debloat enabled kernel on your laptop, too, I am finding most of the
time the bloat is coming from the testing box rather than cerowrt

There are now fq_codel enabled kernels for ubuntu 12.4 and fedora 16
available here:


I also look forward to analyzing htb vs hfsc and further tuning of
qos-scripts and the simple_qos script. I'm too stupid apparently to
come up with a way to run simple_qos out of the aqm gui... (help

The new version of quagga-babeld is available in the opkg repostitory
and it has been confirmed to work right with ipv4 mesh interfaces. I
am really looking forward to people trying this and the authentication
code now in quagga so we can migrate off of the existing babeld.

Have fun. I am traveling the rest of this week. Patches, benchmarks
and data gladly accepted (preferably on the cerowrt-devel list)

Dave Täht
SKYPE: davetaht

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