> I think, but am not certain, jch is referring to the problem of > negotiating ecn over uTP.
No, I was actually unaware that Linux allows one to set the ECN bits from userspace. OTOH, you're right that µTP doesn't currently support ECN. Not that it matters much, ECN is useful for interactive connections (where it can avoid a one-RTT delay due to a packet loss) but pretty useless for bulk transfers[1]. On a related note, the µTP framing is pretty horrible IMHO, and LEDBAT is better implemented within TCP. Unfortunately, this is not possible under Windows (yeah, I got one of the µTorrent guys to contact Microsoft on this subject). On a note related to the related note, Transmission already has the ability to make use of a non-default congestion controller for TCP: http://www.pps.jussieu.fr/~jch/software/bittorrent/tcp-congestion-control.html -- Juliusz [1] Marek Malowidzki, Simulation-based Study of ECN Performance in RED Networks, In Proc. SPECTS'03. 2003. _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
