Throughput Graph

Throughput graphs (named X2Y_tput.xpl) are generated with the -T option. A sample throughput graph is shown in Figure 5.9.

Figure 5.9: Throughput Graph

The graph has throughput in bytes/second on the Y-axis and time on the X-axis.

• Yellow Dots represent instantaneous throughput, defined as the size of the segment seen divided by the time since the last segment was seen (in this direction).
• Blue Line tracks the average throughput of the connection up to that point in the life time of the connection (total bytes seen / total seconds so far).
• Red Line tracks the throughput seen from the last few samples, calculated as the average of N previous yellow dots. By default the line tracks the past 10 samples (N=10). However it can be changed with the -AN option. For example giving -A5 along with the -T option calculates the throughput from the past 5 yellow dots to draw the line.

Due to clock granularity, there tends to be a lot of banding of the dots. If you find the yellow dots annoying, you may turn them off with the -y option.