[Bloat] About LEDBAT, µTP and BitTorrent
Luca Dionisi
luca.dionisi at gmail.com
Fri Feb 4 02:18:23 PST 2011
On Fri, Feb 4, 2011 at 11:04 AM, Juliusz Chroboczek <jch at pps.jussieu.fr> wrote:
>> I think that the 2 things have to be carried on independently,
>
> Yes.
>
>> The problem is that one cannot make sure that end users will act
>> fairly, by adjusting their sending rate. The only way to do this is
>> dropping packets, so that they are obliged to send again.
>
> Well, the issues of increased delay and greedy, unresponsive flows are,
> to a certain extent, distinct. One can image AQMs that are only
> concerned with penalising unresponsive flows but don't do anything to
> reduce buffer size when all flows are well-behaved. Conversely, one can
> imagine solving the buffer bloat problem on the assumption that all
> flows are TCP-friendly.
I don't get it. Why do we need to make such an assumption?
If the routers keep a low buffer size (better if dynamically, if I am
correct) and much better if they *also* implement a AQM which
rate-limit the unresponsive flows, then we will have almost solved the
problem and *also* actually discouraged unfair behavior from clients.
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