File Transfer: two systems produce files whose payload is the message to be processed by the other system.
文件传输：两个系统生成文件，文件的有效负载就是由另一个系统处理的消息。
2
This indicates that the relationship between payload, TCP packets, and transfer time is non-linear and that the first packets on a connection are relatively more expensive than the rest.
这表明负荷、tcp包和传输时间之间的关系并不是线性的，而且第一个连接上的包比其他包更耗资源。
3
The total transfer time is mainly affected by the burst loss probability, and increase linearly with the payload.