[mrtg] Re: 95th Percentile

[Matthew Shields]

To calculate 95th percentile this is what happens. Normally if you were
taking averages every 5 minutes, that means that there are 8928 data samples
taken in a 31 day month.  You need to arrange the samples in decending
order(from highest to lowest), and since you are looking for the 95th
percentile, you need to discard the top 5%(or 446 samples), the 447th sample
will be your 95th percentile.

Example, 95th Percentile of 20 sample listed below would be 14.  Since 5% of
20 is 1, you get rid of the top 1 sample(s).  Which leaves you with 14 as
being the 95th percentile.

15
14
12
12
11
11
11
11
10
10
10
10
9
9
9
9
8
8
7
7

In case you're wondering ISP sometimes offer this to customers as a way of
billing burstable bandwidth(ex. Frac DS3 3mb with bursting to 10mb), which
offers the customer the price of a lower speed connection(3mb), with the
ability to burst to higher speeds without paying for that higher speed, only
paying for the 95% usage above.  On a larger scale of samples it's easy to
see how this would benefit a customer.

Matthew Shields
Verio New England(MA,CT,NH,ME,RI,VT)
Customer Installation Engineer
mas at verio.net

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Luis Camacho
Sent: Thursday, October 12, 2000 11:18 AM
To: Mrtg
Subject: [mrtg] Re: 95th Percentile



I too, am interested in finding out how to calculate at the percentile
level.

If there are any documents that show how (from an NT stand point)  Please
lead me in the right direction.

Thanks in advanced

Luis

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Peter Barton
Sent: Wednesday, October 11, 2000 6:37 PM
To: 'mrtg at list.ee.ethz.ch'
Subject: [mrtg] 95th Percentile


Hello, I have been doing a lot of research on the calculation of the 95th
percentile using MRTG log files.  I have looked through the archives and
found some useful scripts.  What I was wondering is if anyone had a script
that created a web page plotting Daily, Weekly or Monthly 95th percentiles?
I have a .jpg attached to this email showing a nice graph that I would like
to be able to replicate.  However, I am not much of a perl programmer so I
am seeking help.

Thanks,

----------
Peter Barton
Sr. Network Engineer
BroadBandNow!
1440 Corporate Dr
Irving, TX 75038
(972)650-6900




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