On Wed, Dec 17, 2014 at 8:54 AM, Marco Gaiarin <gaio@xxxxxxxxx> wrote: > Mandi! Dave Taht > In chel di` si favelave... > >> The two treatments of quantum are very different. > > Very clear, thanks. Took me a long while to figure it out! > >> fq_codel is also sensitive to the overall bandwidth on the link. At >> rates below 2.5mbit, presently, target and interval should be bumped >> to account for the induced mtu time. > > I'm roughly now on a 4M/640K, so seems i can keep default values on > that. > But i've also to manage some even lower end lines; what are preferred > value for rates below 2.5mbit? You should account for 1MTU. If your mtu is 1500 bytes, and your bandwidth 1mbit, that is 13ms. Feel free to put in a little slop, rounding up to a target 15ms interval 150ms in that case. At really low rates (like your 640k) sometimes SFQ is still better. Life is really hard with modern tcps at that rate. Feel free to fiddle. We have improved this in later versions of fq_codel (cake), so it figures it out for you. tc qdisc add dev eth0 root cake bandwidth 1mbit # should do the right thing. But cake ain't fully baked yet, and we haven't worked out the interactions with htb yet, in particular. > Thanks. > > -- > dott. Marco Gaiarin GNUPG Key ID: 240A3D66 > Associazione ``La Nostra Famiglia'' http://www.sv.lnf.it/ > Polo FVG - Via della Bontà, 7 - 33078 - San Vito al Tagliamento (PN) > marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 f +39-0434-842797 > > Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA! > http://www.lanostrafamiglia.it/25/index.php/component/k2/item/123 > (cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA) > -- > To unsubscribe from this list: send the line "unsubscribe lartc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Dave Täht thttp://www.bufferbloat.net/projects/bloat/wiki/Upcoming_Talks -- To unsubscribe from this list: send the line "unsubscribe lartc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
