North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: 95th Percentile again (was RE: C&W Peering Problem?)
On Sun, 3 Jun 2001, Joe Abley wrote: > > I think your argument is in favor of 95th percentile vs an accurate > > average, not rate vs amount samples. If for some reason you lose a sample > > with an average system, your revenue goes down, whereas if you lose a > > sample in 95th percentile you're more likely not to make it go down much. > > Not really. For any averaging function you care to apply to the sample > population, there will be some samples that tend to increase the > result, and some that tend to decrease the result. Whether or not the > billable value goes up or down depends on the sample that was dropped, > on the remaining samples, and on the averaging function being used. No, you're working under the assumption that the divisor goes up only with increased samples, while the system I outlined continues to go up with the progression of time. No reason that can't be changed though, and that isn't important to the argument... :P > > I'd say the real problem is with the vendor. Fortunantly most people have > > counters. > > Suppose you are selling transit to several customers across a switch > operated by someone else (an exchange operator, for example), such > that the traffic for several customers is carried by a single > interface on your router. Suppose direct interconnects are not > practical, and suppose you have no access to any counters that may be > available on the switch. > > The options are: (1) do not sell to these customers, or (2) find some > way to sell to these customers by counting packets yourself. Option > (1) presents a far more consistent opportunity to decrease potential > revenue than does option (2). You can do it with VLANs, I believe Equinix does this on their exchange switches. -- Richard A Steenbergen <[email protected]> http://www.e-gerbil.net/ras PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6)
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