nanog mailing list archives
RE: What does 95th %tile mean?
From: "Richard A. Steenbergen" <ras () e-gerbil net>
Date: Thu, 19 Apr 2001 21:37:58 -0400 (EDT)
On Thu, Apr 19, 2001 at 05:18:02PM -0700, David Schwartz wrote:
Same algorithm, same raw data, different 95% answers, both valid, yet one is twice as large as the other. Great outcome for a billing system isn't it?Any billing scheme based upon statistical sampling will, with some probability, err in the favor of one party or the other randomly. But it is important that the customer understands that he is being billed based upon statistical sampling and thus there are no "exact" measurements.
Fair billing sysems? The traffic "samples" are just the current value of a byte counter minus the value of that same counter <x> minutes ago, divided by <x>. If you wanted to be "fair", you would bill on exact number of bytes transfered. But on the subject of fair... Most people bill on counters from their customer aggregation switch, but if you transfer data between two customers you are billed as though you sent it around the world, how is this fair? If you send traffic out a paid transit or free peer it costs you the same, how is this fair? If you pay only the higher of your inbound or outbound traffic, and you are a web server pushing 100Mbit out, then you get that 99.9Mbit in if you pay for it or not, how is that fair? How many people actually count every byte they transfer, and how many ISPs are actually capable of matching your count with theirs so you know they are not inflating their numbers either deliberately or accidentally. Hell, do you think the price you pay is fair? There is a reason major ISPs dont publish their prices openly, and that is because if you are not helping some sales person make his Z8 payments or comparison shopping and demanding better prices, you are probably getting screwed. Some people will charge for putting you on redundant uplinks with HSRP/VRRP, some will not. Some people will have redundant diverse well-planned infrastructures and some will not. Some will charge for both directions and 95th percentile, some will charge for 1 and 90th percentile. They will all claim to have better networks then they really do in one form or another, and they will all hide behind an NDA to make sure you don't find out because like it or not everyone has some skeleton in their wiring closet. And yes some will have huge amounts of money yet be run by idiots, and some will have almost no money and scrape out a solid reliable network. That is the nature of business, and fair is what you are willing to pay for the service you get. If you don't like it, vote with your wallet. :P -- Richard A Steenbergen <ras () e-gerbil net> 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)
Current thread:
- Re: What does 95th %tile mean?, (continued)
- Re: What does 95th %tile mean? Greg A. Woods (Apr 19)
- Re: What does 95th %tile mean? Greg A. Woods (Apr 19)
- RE: What does 95th %tile mean? David Schwartz (Apr 19)
- Re: What does 95th %tile mean? John Fraizer (Apr 19)
- RE: What does 95th %tile mean? Lee Watterworth (Apr 19)
- RE: What does 95th %tile mean? RJ Atkinson (Apr 19)
- RE: What does 95th %tile mean? Dearborn, Jeffrey S. (Apr 19)
- Re: What does 95th %tile mean? Sean Donelan (Apr 19)
- Re: What does 95th %tile mean? Geoff Huston (Apr 19)
- Re: What does 95th %tile mean? Greg A. Woods (Apr 19)
- RE: What does 95th %tile mean? Richard A. Steenbergen (Apr 19)
- RE: What does 95th %tile mean? Greg A. Woods (Apr 19)
- Re: What does 95th %tile mean? Toby_Williams (Apr 20)
- Re: What does 95th %tile mean? Alex Pilosov (Apr 20)
- Re: What does 95th %tile mean? Arnold Nipper (Apr 20)
- Re: What does 95th %tile mean? Greg A. Woods (Apr 20)
- Re: What does 95th %tile mean? Alex Pilosov (Apr 20)
- Re: What does 95th %tile mean? richb (Apr 20)
- Re: What does 95th %tile mean? k claffy (Apr 23)
- RE: What does 95th %tile mean? Andrew Odlyzko (Apr 23)
- Re: What does 95th %tile mean? Henry Yen (Apr 23)
- RE: What does 95th %tile mean? Greg A. Woods (Apr 23)
(Thread continues...)