Keith, On Wed, Jul 10, 2013 at 4:19 PM, Keith Winstein wrote: > Thank, Dave. > > We have a Web site with more info, a talk, and source code ( > http://alfalfa.mit.edu) if anybody is interested. > > Something that may interest folks here is that we compared > Sprout-over-unlimited-buffer with TCP-Cubic-over-CoDel on these > cellular-type links. That is, a scenario where the network operators > implemented CoDel inside the LTE/UMTS/1xEV-DO base station (for the > downlink) and the phone manufacturers implemented CoDel inside the > "baseband" chip for the uplink. > > Bottom line results is that for the case where a cellular user can control > all their own flows, it's roughly a wash. To a first approximation, you can > fix bufferbloat on a cellular network *either* by putting CoDel inside the > base station and baseband chip (and otherwise running the same endpoint > TCP), *or* by changing the endpoints but leaving the base station and > baseband chip unmodified. > Did you compare with fq_codel? None of us (Van included) advocate CoDel by itself. > > Obviously we benefit dramatically from the per-user queues of the cellular > network. By contrast, in a typical house with a bufferbloated cable modem > where one user can cause big delays for everybody else, you can't fix > bufferbloat by fixing just one endpoint. We will have some results soon on > whether you can fix it by fixing all the endpoints (but still leaving the > "bloated" gateway intact). > Yup, per user queues help. But those per-user queues can be extremely large; you can hurt yourself as soon as you want to mix your WebRTC kind of traffic with anything else. Jim > > Cheers, > Keith > > On Wed, Jul 10, 2013 at 3:30 PM, Dave Taht wrote: > >> I haven't been paying a lot of attention to rmcat and webrtc until >> recently, although I'd had a nice discussion with keith on it a while >> back.. >> >> this particular thread sums up some interesting issues on that front. >> >> http://www.ietf.org/mail-archive/web/rmcat/current/msg00390.html >> >> -- >> Dave Täht >> >> Fixing bufferbloat with cerowrt: >> http://www.teklibre.com/cerowrt/subscribe.html >> > > > _______________________________________________ > Codel mailing list > Codel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/codel > >