UM0851 datasheet(66/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

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Doc ID 16604 Rev 2

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4.3.4

USB Host performance

The driver performace 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

●

Benchmark: testusb (www.linux-usb.org/usbtest/testusb.c)

●

Test method

The target board is connected to the Linux PC via an USB standard A/B cable.

On host side run testusb using the following command:

./testusb -D /proc/bus/usb/bus No/dev No. -t 1 -s 4096 -c 10

D = It used to pass the gadget zero bus id and device id

t = It used to pass the test type (1 is BulkOUT, 2 is BulkIN)

s = block size (4096,8192,16384,32768,65024)

c = test loop count

On target side run gadget zero as a module using make menuconfig to declare it as a

module and make modules to build it. Then insert the module passing the size of the

buffer as a parameter: insmod g_zero.ko buflen=4096.

●

Test result

The following are the results using following commands:

Target: insmod g_zero.ko buflen=4096

HOST: ./testusb -D /proc/bus/usb/bus No/dev No. -t 1 -s <BlkSize> -c 100

HOST: ./testusb -D /proc/bus/usb/bus No/dev No. -t 2 -s <BlkSize> -c 100

Table 20.

USB Host device performance results

BlkSize

(KB)

Data Size

(KB)

BulkOUT time

(s)

BulkOUT

throughput

(Mbps)

BulkIN time

(s)

BulkIN

throughput

(Mbps)

400

0.03125

104.8576

0.03125

104.8576

800

0.044016

148.8913123

0.034125

192.0468864

1600

0.064312

203.8064436

0.057234

229.0107279

3200

0.107938

242.8653486

0.10739

244.1046652

4000

0.13325

245.9136961

0.132797

246.7525622

8000

0.24764

264.6422226

0.24686

265.4784088

160

16000

0.489281

267.8869607

0.4757

275.5350011

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