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Bandwidth test between Davies Reef and JCU
Results of the network bandwidth test between Davies Reef and JCU
The aim is to measure the available network bandwidth between the Davies Reef installation and the private VLAN at JCU. The network topology between the two looks like this:
Davies Reef network <-- microwave link (10Mbps) --> AIMS pumphouse network <-- DSL link --> AIMS main network <-- fibre optic --> private VLAN @ JCU
Test setup
4 sets of 4 tests were carried out over 4 days. In each test, the same setup was used:
A TCP port was opened on a computer on the private VLAN at JCU (192.168.0.47). Froggie (at Davies reef, 192.168.0.10) then connected to the TCP port and both parties sent packets over the TCP connection as fast as possible. The traffic generated was captured on the JCU side and analysed with WireShark.
TCP was used instead of UDP. Even though TCP requires more processing power than UDP, at this sort of speeds, CPUs on both side are definitely fast enough and managed to sent packets faster than the network could handle.
Results
There is not much variation in the results: a sustained traffic around the 250kBytes/s mark in each direction as shown on the picture below.
(the Y axis scale is in Bytes and the X axis in 0.1 second, so the read value needs to be x 10 to get to Bytes/sec)
An interesting consequence: the loss of connectivity caused the flow of packets to fluctuate more in one direction (from JCU to Davies reef).
