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The goal in these tests is to study the TCP friendliness of the
UDT protocol. This has been done by
measuring the effect of one large UDT
flow upon many, small TCP flows. In these tests the
UDT flow will be started as first and
after some time the TCP flows, or the other way around. As stated in the
"Introduction", a
modified
version of the Iperf
traffic generator is used to be able to shape the TCP bandwidth sufficiently.
The TCP flows are generated between two sets of
N DAS-2 cluster nodes
which are separated in two VLAN's. To obtain sufficient diversity in the
# flows, each node in the source VLAN is sending one flow to each of the
N receiving nodes in the destination VLAN. A flow between sender
and receiver may consist of one or more parallel streams
(Iperf
option -P; implemented with the pthread library).
In these tests the following parameters have been varied:
In the next sub-sections some parameter cross-sections of the data sets described in the previous section will be presented.
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