This paper provides a preliminary assessment of the effectiveness of an application layer tool that measures the Bulk Transfer Capacity (BTC) of a network path. BTC is roughly defined as the throughput that a flow using standard congestion control techniques would obtain across a given network path at a given time. We utilize the NIMI mesh of measurement hosts to compare stock BSD TCP with a new BTC measurement tool,  cap . While BTC tools have been around for some time, no systematic evaluation of their accuracy with respect to standard TCP congestion control across a wide variety of network paths has been conducted. The goal of this paper is to provide such an empirical evaluation of a BTC tool and therefore assess the reliability of the measurement obtained using BTC tools.
['Mark Allman']
Measuring end-to-end bulk transfer capacity