Throughput
7
Figure 3 PCI-X GigE Tx Performance Compared to: Tx + FC BD
Figure 3 shows PCI-X Gigabit Ethernet Transmit (Tx) performance. With 1, 2, or 4 cells
configured, the following throughput rates were achieved:
• Transmit throughput on the GigE port with no Fiber channel traffic on a 1 cell partition is
900 Mbits/sec. As the partition size is increased by adding up to 3 additional cells,
transmit throughput decreases to 868 Mbits/sec.
A similar pattern emerges when GigE transmit and FC bidirectional are combined.
GigE transmit throughput is 700 Mbits/sec on a 1 cell partition and decreases to 638
Mbits/sec as partition size is increased to 4 cells.
• When tested in a PCI-66 slot, the performance results for transmit only throughput
showed no decrease in performance when compared to PCI-X. When GigE transmit
and FC bidirectional traffic are combined, PCI-66 performance is 440 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.
890
658
868
638
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Tx Tx + FC BD
Mbits/sec
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4 Cells
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