-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Will,
I'm writing a p2p simulator at the moment and I've been facing similar questions. Here's what I've come up with. If you're looking for the distribution of the mean latencies of different links (rather than the distribution of the latencies of packets on a given link), Figure 5 of [1] shows what looks to me like a lognormal distribution with median 140ms, 20th percentile 70ms and 80th percentile 280ms. Lognormally distributed samples are easy to generate: exp(x) where x is normally distributed. As for packet loss, er, I'm at a loss. Figure 3a of [1] gives distributions for upstream and downstream bandwidth (unfortunately not as neat as the latency distribution). But even if we know the bandwidth of the access link, the amount of packet loss you experience will depend on the amount of background traffic, how the background traffic reacts to packet loss, and how your traffic reacts to packet loss. If your traffic is TCP-friendly and you can estimate how many other TCP or TCP-friendly connections will be sharing the access link then it should be possible to work out the steady-state packet loss... possibly by rearranging Equation 1 in [2] to give p as a function of T, s, and R? I have a feeling that t_RTO can be estimated as 4*R but I can't remember where I read it. :-) That's as far as I've got - any pointers appreciated! Cheers, Michael [1] http://www.cs.washington.edu/homes/gribble/papers/mmcn.pdf [2] http://www.icir.org/tfrc/aimd.pdf -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (GNU/Linux) iD8DBQFEjcIByua14OQlJ3sRAj+YAJ9d8c34/USAfSe3fQ0Vip4+WFuFyACeJqrP HJtP8b16E/TSOLvw3OjzYeM= =DiuN -----END PGP SIGNATURE----- _______________________________________________ p2p-hackers mailing list [email protected] http://zgp.org/mailman/listinfo/p2p-hackers _______________________________________________ Here is a web page listing P2P Conferences: http://www.neurogrid.net/twiki/bin/view/Main/PeerToPeerConferences
