nanog 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 samevalue for the 95th percentile. Most of us larger folks need to check more often to prevent 32bit counters from rolling over too often. Are you largerfolks 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 and the answers varied wildly. It would appear from my latest check that it is becoming more standardized on 5-minute averages, so I'm asking here on Nanogas 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. -- Jo Rhett senior geek SVcolo : Silicon Valley Colocation
Current thread:
- How do you (not how do I) calculate 95th percentile? Jo Rhett (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Tom Sands (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? David W. Hankins (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Tom Sands (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? David W. Hankins (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Warren Kumari (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Alex Rubenstein (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Warren Kumari (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Alex Rubenstein (Feb 22)
- <Possible follow-ups>
- RE: How do you (not how do I) calculate 95th percentile? Russell, David (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Daniel Roesen (Feb 23)
- RE: How do you (not how do I) calculate 95th percentile? Greenhagen, Robin (Feb 22)
- Re: How do you (not how do I) calculate 95th percentile? Tom Sands (Feb 22)