This chapter examines the statistical characteristics of source-level trace replay experiments, comparing them to those of their corresponding original traces. As discussed in Chapter 5, and illustrated in Figure 5.1, a packet header trace and its source-level trace replay can be compared at two levels. The first level is how well the set of connection vectors extracted from are preserved by the trace replay experiments. This means to collect a packet header trace from the replay and extract a new set of connection vectors . Section 5.2 presented a comparison of and for three traces. It demonstrated that the characteristics of captured by are accurately reproduced by the traffic generation method and its implementation. The second level at which traces and their replays can be compared is to directly extract statistics from and . If these statistics are reasonably close, we can say that the traffic generation method reproduces the original traffic using closed-loop traffic generation. This is the type of comparison discussed in this chapter. As we will show, source-level trace replay generally results in a good approximation of the statistical characteristics of the original traffic, which supports the use of the a-b-t model as a foundation for realistic traffic generation.
Doctoral Dissertation: Generation and Validation of Empirically-Derived TCP Application Workloads
© 2006 Félix Hernández-Campos