HP 2G PCI-X 2 Gigabit Fibre Channel and Gigabit EthernetPerformanceUsing the H - Page 6

Throughput Throughput GigE Traffic Alone Compared to GigE Traffic in Conjunction with FC Bidirectional Figure 2 PCI-X GigE Rx Performance Compared to: Rx + FC BD 1000 900 800 700 Mbits/sec 600 500 929 924 921 400 837 837 830 1 Cell 2 Cells 4 Cells 300 200 100 0 Rx Rx + FC BD Figure 2 shows PCI-X Gigabit Ethernet Receive (Rx) performance. With 1, 2, or 4 cells configured, the following throughput rates were achieved: • Receive throughput on the GigE port with no Fiber channel traffic on a 1 cell partition is an excellent 929 Mbits/sec. As the partition size is increased by adding up to 3 more cells, receive throughput shows no significant drop in performance. A similar pattern emerges when GigE receive and FC bidirectional are combined. GigE receive throughput is 837 Mbits/sec with no significant change as partition size is increased. • When tested in a PCI-66 slot, the performance results for receive only throughput are identical to PCI-X performance. When GigE receive and FC bidirectional traffic are combined, PCI-66 performance is 585 Mbits/sec with no significant change as partition size increases. The decreased performance seen when both ports are active on the A9782A/A9784A is a result of the bandwidth limitation of the PCI-66 technology and is not due to a limitation in the adapter. 6