UM0851 datasheet(52/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

52/245

Doc ID 16604 Rev 2

4.1.6

GMAC driver performance

The driver performance was evaluated using the following setup:

●

Host PC

–

Linux Fedora Core11

–

Processor: 1 GHz AMD Athlon 64 bit dual core

–

RAM: 1 GB DDR2 RAM (667 MHz)

–

Gigabit Ethernet

●

Target device: SPEAr600

–

CPU: 332 MHz - AHB: 166 MHz - DDR: 333 MHz

●

Ethernet Traffic Sniffer: Ethereal On Linux PC

●

Benchmark: netperf/netserver (http://www.netperf.org/netperf/)

●

Test method

The target board is connected to the Linux PC via an Ethernet cross cable. A terminal

emulator running on the Windows PC (connected via the serial port) is used to run the

Linux image and execute test cases. The netserver is run on the Linux test PC and the

netperf is run on the target board (with the necessary options for different test cases) to

measure the transmission throughput and vice versa to measure the reception

throughput.

The test method covers the following combination of tests. The MTU size varied from

4000 to 1500 bytes and for each set of readings the various combinations for

Checksum offloading (On/Off) with CRC stripping(on/off) were tested.

●

Test type

Netperf is a benchmark that is used to measure the performance of Ethernet. It uses

TCP and UDP via BSD sockets. It provides tests for both unidirectional throughput and

end-to-end latency. The worksheet provides test results for TCP_STREAM

performance tests.

●

At giga speeds.

Table 15.

SPEAr600 Ethernet evaluation results

MTU

Checksum offloading disabled

Checksum offloading enabled

CRC strip off

CRC strip on

CRC strip off

CRC strip on

RX speed Tx speed

speed

Tx speed

speed

Tx speed

speed

Tx speed

4000

322.61

235.88

321.35

234.76

382.72

241

383.96

241.76

3500

293.98

228.06

289.91

226.32

352.91

233.95

354.58

232.56

3000

263.75

211.86

260.1

208.12

311.38

217.57

308.92

211.88

2500

223.37

205.03

220.51

203.47

261.86

207.65

257.47

206.32

2000

192.01

174.23

191.38

172.88

225.96

177.46

226.55

175.31

1500

168.3

143.6

170.12

142.41

201.64

146.95

204.48

144.82

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