On Sat, Nov 22, 2003 at 09:35:45AM -0500, Ed Tomlinson wrote: > On November 22, 2003 09:12 am, Edward J. Huff wrote: > > On Fri, 2003-11-21 at 04:23, Ian Clarke wrote: > > > Edward J. Huff wrote: > > > > It seems to me that NGR can't possibly do certain things. > > > > When the standard deviation exceeds the mean, you can't > > > > even predict the sign of your random variable. > > > > > > The standard deviation exceeding the mean, if it does occur, isn't the > > > fatal problem you think it is. NGR's data is likely to be extremely > > > noisy, but provided that it is able to extract some generalization it > > > should work, irrespective of the std dev. > > > > The question at issue is whether NGR can be used to distinguish > > between nodes based on bandwidth, while the bandwidth available > > to a transfer is allowed to vary randomly depending on requests > > from other nodes. The issue is complicated: any node can > > have its marginal available bandwidth fall near zero, and there > > is a positive feedback loop through the estimators leading to > > oscillation and inefficient use of resources. > > This is a very very important point. The first NGR implementation > did not use transfer rates in its estimators - maybe, exploitable as > it was, it made more sense. It really depends on if transfer rate is > predictable for a given node. Given that outbound bandwidth is > more often than not the limiting constraint on a node I suspect > that its not all that predictable...
I dunno, it may well be transferring the same approximate number of trailers over a long period... > > Ed > > > I think this is a valid and important question. Your response > > does not address it. > > > > -- Ed Huff -- Matthew J Toseland - [EMAIL PROTECTED] Freenet Project Official Codemonkey - http://freenetproject.org/ ICTHUS - Nothing is impossible. Our Boss says so.
signature.asc
Description: Digital signature
_______________________________________________ Devl mailing list [EMAIL PROTECTED] http://dodo.freenetproject.org/cgi-bin/mailman/listinfo/devl
