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Performance Analysis
Users, administrators, and designers of computer
systems are all interested in performance evaluation, since their goal
is to obtain or provide the highest performance at the lowest cost.
This goal has resulted in continuing evolution of higher performance and
lower cost systems leading to today's proliferation of workstations and
personal computers, many of which show better performance than earlier
so-called super computers. (Jain)
There are three techniques for performance evaluation
are analytical modeling, simulation, and measurement. There are many
considerations that aid in determining the technique to be used such as
time required, tools required, accuracy and more. In the case of
this experiment, since the SmartBits is a measurement tool, we will be
using the measurement technique only.
Metrics - units for performance measurements such as throughput, delay,
etc...
Parameters - list of system and workload characteristics that affect
performance
Factors - the parameters that are to be varied to gauge affects on
performance
Metrics
Throughput - measured in packets/sec or MB/sec
Delay - measured in nano-seconds per hop
Error Rate - measured in errors/sec
Time of Execution - time elapsed during execution
Parameters
Background Traffic - prefer isolated test network
Background Processes - may affect Router forwarding rates
Interference and Noise - mechanical, electrical, or magnetic
User Adjustable Factors
Factors
Packet Size - Ethernet varies from 64 -1500 bytes
Packet Rate - Speed at which packets are offered into the network in
packets per second
Inter Packet Gap - delay time between offered packets
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