Performance and Recommended Use of AD222A, AD393A, and AD221A PCIe Combination 4-Gbit/s Fibre Channel and Gigabit Ethernet Cards

Request-Response tests were also run to demonstrate the capability of how the adapter

handles traffic of this nature. TCP Request-Responses tests were run using a request size of

1-byte and a response size of 1-byte. The aggregate number of transactions that could be

sustained with a processor per port running close to saturation was captured. Figure 7

below shows the number of transactions per second.

Figure 7: AD222A Gigabit Ethernet Request Response Transactions

20000

40000

60000

80000

100000

120000

140000

160000

180000

Transactions Per Second

Transcations Per Second

83966 166302

1 Port 2 Ports

Service demand and CPU Utilization are also measured for each throughput test. Table 2

shows the details. Service demand is the amount of time (in microseconds) it takes a CPU

to handle one kilobyte of data. It is a normalized measurement because it eliminates

disparities due to differences in quantities, types, or frequencies of CPUs. CPU utilization

is normalized over 8 CPUs.

Table 2 Gigabit Ethernet Service Demand

1 Gigabit Ethernet Port 2 Gigabit Ethernet Ports

1500-byte

MTUs

Throughput

mbit/s

usec/KB

CPU

Utilization

Throughput

mbit/s

usec/KB

CPU

Utilization

Transmit 948 2.098 3% 1,895 2.077 6%

Receive 948 3.333 5% 1,895 3.368 10%

Bi-directional 1,880 2.959 8% 3,762 3.017 17%