Throughput
8
Figure 4 PCI-X GigE BD Performance Compared to: BD + FC BD
Figure 4 shows PCI-X Gigabit Ethernet Bidirectional (BD) performance. With 1, 2, or 4
cells configured, the following throughput rates were achieved:
• Bidirectional throughput on the GigE port with no Fiber channel traffic on a 1 cell
partition is 1250 Mbits/sec. As the partition size is increased by adding up to 3 more
cells, bidirectional throughput decreases to 1175 Mbits/sec. A similar pattern emerges
when GigE bidirectional and FC bidirectional are combined. GigE bidirectional
throughput is 884 Mbits/sec on a 1 cell partition and decreases to 865 Mbits/sec as
partition size is increased to 4 cells. You see a more significant decrease on the
A9782A/A9784A when both ports are active due to the inherent bandwidth limitations
of the PCI-X technology when both links are carrying full bidirectional traffic.
• When tested in a PCI-66 slot the performance results for bidirectional only throughput
showed no decrease in performance when compared to PCI-X. When GigE
bidirectional and FC bidirectional traffic are combined, PCI-66 performance is 592
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.
884
1206
881
865
1250
1175
0
200
400
600
800
1000
1200
1400
BD BD + FC BD
Mbits/sec
1 Cell
2 Cells
4 Cells
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