I just got a better understanding of Bob's proposal. Great direction indeed! I fully agreed that doing the smoothing at the end hosts and simple network congestion signals is the best way to achieve low averaging latency.
We do need these three working groups working together to get this done. But since folks usually attend all these three meetings at IETF, I am hopeful that IETF can make it happen with all our efforts together here. Bob, a technical question. If we do no averaging for ECN, and hosts use the tradition ECN-capable TCP, I am afraid its window might get cut too much to achieve any reasonable throughput. Any thought on how to handle that? Or maybe you already covered in your slides and I missed it? Thanks, Rong On 11/7/13 12:03 PM, "Bob Briscoe" <[email protected]> wrote: >Folks, > >"Immediate ECN" slides: ><http://bobbriscoe.net/presents/1311ietf/1311tsvarea-iecn.pptx> ><http://bobbriscoe.net/presents/1311ietf/1311tsvarea-iecn.pdf> > >PS. This talk fell off the end of the TSVAREA agenda. It's mostly >relevant to AQM, but I didn't originally bring it to AQM, because it >affects 3 wgs: tsvwg, aqm & tcpm. > >In the AQM wg, there was dismay about CableLabs not including >anything about ECN in DOCSIS3.1. This talk is about AQM dynamics; and >how ECN can take out the 100ms of delay that CoDel and PIE introduce >- it's essentially about auto-tuning for RTT. > >It gives an interim recommendation for hardware designers that there >should be a second instance of the AQM algo for ECN packets so that >it can be configured with different parameters (think of WRED instead of >RED). > >Specifically, for ECN packets: >interval = 0 (for CoDel) >max_burst = 0 (for PIE) > > >Bob > >PS. We have a paper under submission, which we can supply on request. >We plan to document this in the IETF too. > > > > >________________________________________________________________ >Bob Briscoe, BT > >_______________________________________________ >aqm mailing list >[email protected] >https://www.ietf.org/mailman/listinfo/aqm _______________________________________________ aqm mailing list [email protected] https://www.ietf.org/mailman/listinfo/aqm
