Editing Measuring network throughput (section)

{{Essay-like|date=January 2010}}

[[Throughput]] of a network can be measured using various tools available on different platforms. This page explains the theory behind what these tools set out to measure and the issues regarding these measurements.

Reasons for measuring throughput in networks. 
People are often concerned about '''measuring the maximum data throughput''' in bits per second of a communications link or network access. A typical method of performing a measurement is to transfer a 'large' file from one system to another system and measure the time required to complete the transfer or copy of the file. The throughput is then calculated by dividing the file size by the time to get the throughput in [[megabit]]s, [[kilobit]]s, or [[bit]]s per second.

Unfortunately, the results of such an exercise will often result in the [[goodput]] which is less than the maximum theoretical data throughput, leading to people believing that their communications link is not operating correctly. 
In fact, there are many overheads accounted for in throughput in addition to transmission overheads, including [[Network latency|latency]], [[Receive Window#Window size|TCP Receive Window size]] and system limitations, which means the calculated goodput does not reflect the maximum achievable throughput.<ref>Comer, D. E. (2008). Computer Networks and Internets 5th Edition</ref>