On Fri, Sep 8, 2017 at 12:32 AM, Steinar H. Gunderson <[email protected]> wrote: > On Thu, Sep 07, 2017 at 04:52:54PM -0700, Dave Taht wrote: >> good read: >> >> http://caia.swin.edu.au/cv/jkua/preprint/jkua-icccn2017-chunklets-preprint-10may17.pdf > > Aaaaa! > > “For example, FQ-CoDel isolates individual traffic flows into > sub-queues then serves each sub-queue with a Deficit Round > Robin (DRR) scheduler. The result is relatively even capacity > sharing, which may actually be detrimental to a DASH flow > (often a single, persistent TCP connection) that is competing > with multiple other concurrent TCP flows.” > > Isn't this just an AQM sabotage scheme?
Well, first, a paper showing vastly better behavior for dash traffic for fq_codel over pie and tail drop was a reason to celebrate. Secondly, dash is kind of special in that you *are* constantly probing for more bandwidth for a replacement stream, and that does interact with fq in some difficult ways. I wouldn't go as far as calling using two flows to do a probe like this "sabotage", but a practical means of finding the right queue and getting a bit more bandwidth overall. The multipath mosh work (sadly still not mainlined when last I looked) was resistant to hash collisions. It is unclear from the paper to what extent the aqm kicks in - I would have liked some packet drop figures and their onset. I keep hoping to see some resumption of bittorrent experiments... Lastly, I liked the idea of a (in)stability index. > /* Steinar */ > -- > Homepage: https://www.sesse.net/ > _______________________________________________ > Bloat mailing list > [email protected] > https://lists.bufferbloat.net/listinfo/bloat -- Dave Täht CEO, TekLibre, LLC http://www.teklibre.com Tel: 1-669-226-2619 _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
