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In this experiment we fix the number of background flows to 16 and vary
the spare capacity, . To achieve a spare capacity , we set the
bottleneck link bandwidth
,
where
is the total number of bytes
transferred in the trace divided by the duration of the trace.
Figure 2 plots the average document transfer
latency for foreground traffic
as a function of the spare capacity in
the network. Different lines represent different runs of the experiments
using different protocols for background flows. It can be seen that
Nice is hardly distinguishable
from router prioritization whereas, the other protocols
cause a significant increase in foreground latency. Note that the
Y-axis is on a log scale, which means that in some cases Reno and
Vegas increase foreground document transfer latencies by over an order of magnitude.
Arun Venkataramani
2002-10-08