Le jeudi 23 juin 2011 à 17:10 -0600, Dave Taht a écrit : > On Thu, Jun 23, 2011 at 4:45 PM, Juliusz Chroboczek <j...@pps.jussieu.fr> > wrote: > >> It really seems that ECN support could be added generically for all > >> qdiscs that currently do packet drop. Creating a generic mark_or_drop > >> function is easy. > > > > As hinted in a previous message -- please don't. Every qdisc must be > > examined individually to check if it is suitable for ECN. > > > > Consider also the following. If the administrator specifies a maximum > > rate of 100 Mbit/s, he probably doesn't expect the outgoing traffic to > > exceed that rate under any circumstances. If you start marking instead > > of dropping, you must make sure that the resulting traffic is still > > under 100 Mbit/s, including the marked packets. > > In designing this particular concept I made sure that was an option, > in the mildly recorrected: > > http://www.bufferbloat.net/projects/bloat/wiki/Save_the_Ants > > Try harder to not shoot the ants, but make ecn marking a first class > option throughout the qdiscs... > > if possible..
I believe it was done. qdisc implementations are not random, but follow extensive research works. Before doing a change like that, you must redo all the experiments and show the pro/cons ;) Once qdisc queue is _full_, its too late, you have to drop packets anyway. And its not because at least one flow is not responsive : It might be because one thousand flows began their life at the very same moment :( _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat
