Centre closure

As part of a broader organisational restructure, data networking research at Swinburne University of Technology has moved from the Centre for Advanced Internet Architecture (CAIA) to the Internet For Things (I4T) Research Lab.

Although CAIA no longer exists, this website reflects CAIA's activities and outputs between March 2002 and February 2017, and is being maintained as a service to the broader data networking research community.

This page is part of the BART project.

Set A 500usec Packet Inter-Arrival Time


The following section discusses 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 for Set A.

The following Figures show that again for both the 10Mbit/sec and 100Mbit/sec settings, explicity setting the line speed causes the time stamp values to be more consistant than when allowing the interface to detect the line speed. We can clearly see in Figures 7 and 9 that packets being sent on the 10Mbit/sec line require an additional 83usec to propagate, while packets sent on the 100Mbit/sec line require only 8.3usec.

Figure 6: Automatic 10Mbit/sec
Figure 7: Explicit 10Mbit/sec
Figure 8: Automatic 100Mbit/sec
Figure 9: Explicit 100Mbit/sec

The tables below confirm that configuring the receiving PC interface to automatically detect line speed greatly increases the varience and standard deviation.

Table 5: Automatic 10Mbit/sec (usec)

Mean
Varience
Standard Deviation
583.21
9577.29
97.86

Table 6: Explicit 10Mbit/sec (usec)

Mean
Varience
Standard Deviation
583.21
1.08
1.04

Table 7: Automatic 100Mbit/sec (usec)

Mean
Varience
Standard Deviation
508.33
8279.87
90.99

Table 8: Explicit 100Mbit/sec (usec)

Mean
Varience
Standard Deviation
508.33
1.07
1.04





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