In this section we evaluate our Nice implementation over a variety of Internet links. We seek to answer three questions. First, in a less controlled environment than our NS simulations, does Nice still avoid interference? Second, are there enough reasonably long periods of spare capacity on real links for Nice to reap reasonable throughput? Third, are any such periods of spare capacity spread throughout the day, or is the usefulness of background transfers restricted to nights and weekends?
Our experiments suggest that Nice works for a range of networks, including a modem, a cable modem, a transatlantic link, and a fast WAN. In particular, on these networks it appears that Nice avoids interfering with other flows and that it can achieve throughput that are significant fractions of the throughput that would be achieved by Reno throughout the day.