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North American Network Operators Group
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Re: How do you (not how do I) calculate 95th percentile?
- From: Warren Kumari
- Date: Wed Feb 22 17:11:22 2006
Doh! You are 100% correct.
I didn't take into account the fact that the counters are if(In|Out)
*Octets* and NOT if(in/Out)*Bits*.
The point is that 64-bit counters are not likely to roll :-)
Warren
On Feb 22, 2006, at 12:24 PM, Alex Rubenstein wrote:
(I did this fast, and, who knows; I could be off my an order or two
of magnitude)
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 :-)).
2^64 is 18,446,744,073,709,551,616 bytes.
100 GE (100,000,000,000 bits/sec) is 12,500,000,000 bytes/sec.
It would take 1,475,739,525 seconds, or 46.79 years for a counter
wrap.
--
Alex Rubenstein, AR97, K2AHR, alex@nac.net, latency, Al Reuben
Net Access Corporation, 800-NET-ME-36, http://www.nac.net
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