RE: [cobalt-users] Bandwidth Calculations?

["John M Troher" <admin@xxxxxxxx>]

the way alot of ISP's calculate bandwidth based on the 95th percentile

input/output readings are taken every 5 minutes on a fractional T1 for
example.

at the end of the month, the top 5 highest reading are thrown out.
the highest remaining reading would be the usage based on the 95th
percentile.

example 5 highest readings are  384, 422, 765, 492, 602 kilobits per
second/input ,  these get tossed.

the highest remaining reading was 382 kilobits per second/input

you would be charged for the month based on 382 kilobits per second.

that is roughly how it works, many isp's do things different, but it is
usually based on this process.



-----Original Message-----
From: cobalt-users-admin@xxxxxxxxxxxxxxx
[mailto:cobalt-users-admin@xxxxxxxxxxxxxxx]On Behalf Of Rodolfo J. Paiz
Sent: Wednesday, June 06, 2001 1:32 PM
To: cobalt-users@xxxxxxxxxxxxxxx
Subject: Re: [cobalt-users] Bandwidth Calculations?


At 6/6/01 09:05 AM -0700, you wrote:
>Does anybody know how the bandwidth is calculated?

Can be done different ways. Ask your ISP for their particular method as
there is no one "right" way. However...

>1. I have a box that receives lots of unwanted traffic.

>2. I do lots of non-httpd traffic on my own (i.e. upload and download
>huge files using rsync).

>3. If I go fetching some pages (i.e. spider or crawlwer) using non httpd
>means,

You seem to have the idea that HTTP is somehow different from other
traffic. HTTP is a protocol, used for an application, whereas "traffic" is
all about IP packets which are on a much lower level.

If you're a city planner considering a given road, you care how many
*vehicles* use it so you know whether you have enough lanes. You do not
give a damn whether they're cars, motorcycles, vans, or pickup trucks
(let's leave out the semis here for a moment).

Bandwidth is measured in bits per second, traffic is measured in bits. What
those bits contain is irrelevant. Generally yes, all those huge files *do*
count towards your traffic allotment.


--
Rodolfo J. Paiz
rpaiz@xxxxxxxxxxxxxx

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