High Performance TCP/IP communications with HPs and IBMs connected around an Ancor Fibre Channel Fabric
Bi-directional communications have been performed in order to measure the degradation of performance, if any. On figure 6a, the upper curve group (lower curve group on figure 6b) represents the expected bi-directional performance for three different socket buffer sizes. By definition, the expected bi-directional performance is the sum of the performance measured in each direction independently. The lower curve group on figure 6a (upper curve group on figure 6b) represents the measured bi-directional performance.
Figure 6a: Bandwidth performance when bi-directional communications are performed.
Figure 6b: Latency performance when bi-directional communications are performed.
On figure 6c, the table is summarizing the degradation as a function of the socket buffer size and the packet size.
A performance degradation of around 30% on average is reported, with regard to the expected performance. The degradation is a function of the message size and the socket buffer size. For the largest socket buffer size, the degradation is more important for large packets (greater than 1 Kbytes) than for small packets (smaller than 1 Kbytes). For the smallest socket buffer size the degradation is almost constant whatever the packet size is.
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