US Robotics USR2410 Manual de usuario descargar pdf (Pagina 51)

Chapter 8 -

Te sting Methodology and Analysis

The chapter reviews the three different testing methodologies used and the methods of analysis

and results of analysis. Figure 8-1shows a general linear testing topology.

Figure 8-1: Basic Linear Topology

This was selected to maximize the number of hops with the available hardware, and to reduce

testing complexity. It was also a standard configuration, allowing the results obtained to be

applied to more general cases. Within the linear topology two testing metrics were used to

evaluate system performance: throughput and packet delay (RTT). To test these metrics

efficiently three different tests are required: The effect of varying the number of hops, the effect

of a heavily loaded system, and the fairness with respect to clients connected at different mesh

routers. The tests selected were based on the goals set out for the project to examine standard

internet traffic. This as mentioned in Chapter 6 were performed in the engineering 3 hallway,

spaced out to ensure not that there was no overlapping signals from the mesh router. The testing

was adversely affected by the memory leak problem described in Chapter 6, and test data is

understandably incomplete.

8.1

Preliminary Internet Test

A five hop network was established, data in figure shows the connectivity of the network (see

Appendix D for test data). Standard web browsing, file downloading and email were performed

quickly and efficiently by a client. This was done using both the user and kernel level of the

system. Using a web based bandwidth tests it was found that the running the Click Modular

router as a kernel module was noticeably faster than using the user level driver. Since the

difference was so clear, testing was done by running the click modular router as a kernel module

in order to obtain the maximum response out of the network.

8.2 Effect of Number of Hops on the Network

A major reduction in efficiency in a wireless mesh network is cause by the number of hops data

has to travel through to reach its final destination. The test examined the effect of varying the

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US Robotics USR2410 Manual de usuario Pagina 51