The next plot shows the measurement made with 2 streams and 256kByte windows. It can be seen again that the 2 streams contibute about equally to the aggregate. Caltech We made similar measurements from SLAC to Caltech. The table below summarizes the results and compares them with the SLAC CERN measurements. The performance with more streams is better than with fewer streams.
More streams also results in greater RTT change between loaded and unloaded measurements.
The solid green lines represent the dRTT averaged over all the measurements for a given number of streams. For the 8kByte, 16kByte and 55kByte window measurements, for each number of streams there are roughly 21 measurements of the RTT difference and thruput. It is seen that from 1 thru about 10 streams the thruput grows roughly linearly with the number of streams. Above 7 streams the difference in RTT also starts to grow indicating a greater impact on cross-traffic. At the same time beyond 7 streams the variability in the thruput also increases.