An Investigation into Transport Protocols and Data Transport ...

9.4. Summary 243
performance of single flow New-TCP performance over the Internet.
Unsurprisingly, all of the New-TCP algorithms are able to achieve higher
goodputs than that of Standard TCP. In certain circumstances substantially
higher goodput was achieved.
FAST is consistently able to achieve high goodput performance across all
network paths investigated, followed by BicTCP and H-TCP (although the
differences between the latter two are negligible).
Under the lower latency destinations investigated, the performance difference
between the New-TCP algorithms and Standard TCP are not that
great. This is expected due to the TCP algorithm design requirement to
be comparable to Standard TCP under low latency, low bandwidth environments.
The slow growth of cwnd by HSTCP and ScalableTCP with small initial
cwnd values are apparent under the CERN to LBL tests, and serves
to demonstrate that under highly variable network conditions where sudden
flash traffic may occur, they will be incapable of quickly utilising available
bandwidth.
In general, the stability and overhead of all of the algorithms are comparable,
with mixed results from network to network and are influenced primarily
by the number of congestion events experienced.
9.4 Summary
The investigation on real life networks initially began with the analysis of
these New-TCP algorithms on the dedicated wide-area test networks of MB-
NG and DataTAG.
The experiments demonstrated that there are serious implementation