Hi Samuel, My main comment about DCCP in Linux is that it is still very experimental. There is a lot of good work gone into it, but there are also still some problems. I used it for my research also (see my website and click on research) and did quite a bit to get it working for me but I largely used CCID3 and fixed up aspects of that and got code merged for that. I would encourage you to have a go at seeing if you can fix it (provided no-one else does first!) as this will help you in your future research if you are able to work on this aspect. Best regards Ian -- twitter imcdnzl web http://www.next-genit.co.uk On 30 July 2010 22:07, Samuel Jero <sj323707@xxxxxxxx> wrote: > > Hello All, > > I am a researcher at Ohio University looking to encapsulate a special > point-to-point Delay Tolerant Networking protocol in DCCP instead of UDP > to take advantage of DCCP's congestion control. > > In attempting to set this up I have come across some very odd behavior > from DCCP. My goal is to open one DCCP connection and then keep it open > even when the encapsulated protocol is idle (this avoids having a > three-way handshake for every packet sent). However, in my tests, DCCP > clamps the sending rate down to three packets per second after a short > idle period (a few seconds) and then never attempts to increase that > rate. This seems to be a very unusual and counter-intuitive behavior. > Has anyone else seen similar behavior? This seems to contradict RFC4341 > section 5.1 which says that CCID2 should slow start after an idle > period. Is this not implemented yet or is it a bug? > > My test machines are running Ubuntu 10.04. Uname -a > "2.6.32-24-generic-pae #38-Ubuntu SMP Mon Jul 5 10:54:21 UTC 2010 i686 > GNU/Linux". I have seen identical behavior with Ubuntu 9.10 (Linux > 2.6.31). I'm using CCID2 "TCP-like Congestion control" since I want as > much bandwidth as possible, even if that means rapid fluctuations. > > Thanks. > > Sincerely, > Samuel Jero > > -- > To unsubscribe from this list: send the line "unsubscribe dccp" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe dccp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
