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# Method of Polling to Improve Accuracy Without Significant Bandwidth Utilization

IP.com Disclosure Number: IPCOM000123714D
Original Publication Date: 1999-Apr-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 2 page(s) / 46K

IBM

## Related People

Holley, AR: AUTHOR

## Abstract

Disclosed is a method of retrieving data samples from a network that improves the accuracy of bandwidth measurements. This method achieves this without significantly affecting the amount of data transferred across the network as compared to normal polling.

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Method of Polling to Improve Accuracy Without Significant Bandwidth
Utilization

Disclosed is a method of retrieving data samples
from a network that improves the accuracy of bandwidth measurements.
This method achieves this without significantly affecting the amount
of data transferred across the network as compared to normal polling.

Measuring bandwidth from a network is achieved by polling
a network device to retrieve a counter, x1, which is the amount of
data that has been transferred up to that time, t1.  Polling again
will retrieve another number, x2, and time, t2, which is then used to
calculate the bandwidth which is expressed in amount of data, x, per
unit of time, t, typically megabits per second (Mbs).  The smaller
the difference between t2 and t1 the more accurate the measurement of
the data transfer rate.  However, the smaller the value for t, the
more often polls must be done and the more data is being sent across
the network.
x2-x1   x
----- = -
t2-t1   t

When a peak usage occurs, having two alternating interval
periods, a short one like 1 second, and a longer one like 5 minutes,
this method can increase the chances of detecting and recording it.
Fig. 1.  Using the polled values and time deltas, the average data is
shown computed to be about 20 Mbs in the the first delta.  The second
delta is computed to be about 100 Mbs.  The third delta is computed
to be about 20 Mbs.  If the b...