Throughput
6
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
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.
929
924
837
921
830
837
0
100
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500
600
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800
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1000
Rx Rx + FC BD
Mbits/sec
1 Cell
2 Cells
4 Cells
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