Set B 500usec Packet Inter-Arrival Time
The following section shows the difference between automatically allowing the interface to detect the line speed and explicitly setting the line speed of an interface for 500usec packet inter-arrival time.
The following Figures show that for both the 10Mbit/sec and 100Mbit/sec settings, explicity setting the line speed caused the time stamp values to be slightly more consistent than when allowing the interface to detect the line speed. Note, however, that outliers occured for both the automatic and explicit line speed configurations.
Figure 10: Automatic 10Mbit/sec Figure 11: Explicit 10Mbit/sec Figure 12: Automatic 100Mbit/sec Figure 13: Explicit 100Mbit/sec
Tables 9 to 12 correspond to Figures 10 to 13 and show the slight improvement in variance and standard deviation when the line speed was explicitly set due to the reduction in number of time stamp outliers.
Table 9: Automatic 10Mbit/sec (usec)
Mean Variance Standard Deviation 583.251 1.377 1.174
Table 10: Explicit 10Mbit/sec (usec)
Mean Variance Standard Deviation 583.251 1.157 1.076
Table 11: Automatic 100Mbit/sec (usec)
Mean Variance Standard Deviation 508.364 1.649 1.284
Table 12: Explicit 100Mbit/sec (usec)
Mean Variance Standard Deviation 508.364 1.305 1.142
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