On Mon, Nov 26, 2012 at 9:22 AM, Michael Richardson wrote: > > >>>>> "Dave" == Dave Taht writes: > Dave> to move the fq_codel algorithm into the cable modem, OR to have > the > Dave> cable modem exert flow control like ADSL modems do. Then have the > Dave> smarter device (the router) then do smarter queuing. > > I was unaware that DSL models were doing this... is this with GbE > ethernet level XON/XOFF? Should I assume that any DSL model with less > than a GbE sync doesn't/can't have it? Any brands you'd like to > acknowledge? > We don't know that all DSL modems do this. However, in corresponding with Michael Tremer about his results (documented here http://planet.ipfire.org/post/ipfire-2-13-tech-preview-fighting-bufferbloat), it appears that a DSL modem commonly used in Germany does implement Ethernet flow control (or he could not have gotten the results he reports there at all; all he did was turn on fq_codel on the x86 geode router he is using for IPfire). Whether this is "standard" in DSL modems, I have no clue (anyone want to plow through DSL standards documents?). I've been unable to find a supplier in the U.S. for this particular DSL modem. Short of bidding on ebay in Europe, I was defeated (despite there being 10's of millions of them in Germany); this isn't too surprising, as the modem is supplied by the carrier in this case. Note that I'm testing a DGN3500 this week with John Crispin (blogic) which has an integrated Lantiq DSL chip (along with Atheros radios) running fq_codel that John maintains. That may be a better option for DSL, as it can be purchased easily via Amazon. Wish us luck (though John's early data looks really nice). - Jim > -- > ] He who is tired of Weird Al is tired of life! | > firewalls [ > ] Michael Richardson, Sandelman Software Works, Ottawa, ON |net > architect[ > ] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ > > |device driver[ > Kyoto Plus: watch the video > > > then sign the petition. > _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel > > >