mailing list archives
Re: How do you (not how do I) calculate 95th percentile?
From: Warren Kumari <warren () kumari net>
Date: Wed, 22 Feb 2006 11:28:44 -0800
On Feb 22, 2006, at 10:12 AM, Jo Rhett wrote:
A lot of smaller folks check the counter every 5 min and use that same
value for the 95th percentile. Most of us larger folks need to
often to prevent 32bit counters from rolling over too often. Are
folks averaging the retrieved values over a larger period? Using the
maximum within a larger period? Or just using your saved values?
Most people are using 64 bit counters. This avoids the wrapping
problem (assuming you don't have 100GE and poll more then once every
5 years :-)).
This is curiosity only. A few years ago we compared the same data
answers varied wildly. It would appear from my latest check that
becoming more standardized on 5-minute averages, so I'm asking here
as a reality check.
Yup, 5 min seems to be the accepted time.
Note: I have AboveNet, Savvis, Verio, etc calculations. I'm wondering
if there are any other odd combinations out there.
Reply to me offlist. If there is interest I'll summarize the results
without identifying the source.
SVcolo : Silicon Valley Colocation