Interestingly it appears to have a hook directly into hfsc, optionally replacing red.
https://github.com/pfsense/pfsense-tools/blob/master/patches/RELENG_10_0/altq_codel.diff
picked up via my usual daily scan from:
http://freebsd.1045724.n5.nabble.com/PATH-ALTQ-9-codel-algorithm-implementation-td5819058.html
--
Dave Täht
Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html