Throughput
11
Figure 7 PCI-X Fibre Channel Bidirectional Performance
Figure 7 shows PCI-X Fibre Channel Bidirectional (BD) performance. With 1, 2, or 4 cells
configured, the following throughput rates were achieved:
• Bidirectional throughput on the FC port with no GigE traffic on a 1 cell partition is 270
MBytes/sec. As the partition size is increased by adding up to 3 more cells,
Bidirectional throughput decreases to 254 MBytes/sec. A similar pattern emerges when
FC bidirectional and GigE bidirectional are combined. FC bidirectional throughput is
238 MBytes/sec on a 1 cell partition and decreases to 226 MBytes/sec as partition
size is increased to 4 cells.
• When tested in a PCI-66 slot, the performance results for Bidirectional only throughput
showed a similar pattern when compared to PCI-X. Bidirectional throughput on the FC
port with no GigE traffic on a 1 cell partition is 250 MBytes/sec. As you increase the
partition size by adding up to 3 more cells, bidirectional throughput decreases to 230
MBytes/sec. When FC bidirectional and GigE bidirectional traffic are combined, PCI-66
performance is 155 MBytes/sec. As you increase the partition size by adding up to 3
more cells, bidirectional throughput decreases to 127 MBytes/sec. 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.
270
238
253
227
254
226
0
50
100
150
200
250
300
BD BD + GigE BD
MBytes/sec
1 Cell
2 Cells
4 Cells
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