UM0851 datasheet(76/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

76/245

Doc ID 16604 Rev 2

available on host side to execute desired test cases. Please refer to the following link for

details on this test setup.

http://www.linux-usb.org/usbtest/

4.4.5

USBD 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

●

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 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 10

HOST: ./testusb -D /proc/bus/usb/bus No/dev No. -t 2 -s <BlkSize> -c 10

Table 24.

USBD performance results

BlkSize

(KB)

Data Size

(KB)

BulkOUT time

(s)

BulkOUT

throughput

(Mbps)

BulkIN time (s)

BulkIN

throughput

(Mbps)

400

0.039872

82.18298555

0.02514

130.3420843

800

0.041113

159.4045679

0.043696

149.9816917

1600

0.050237

260.9072994

0.062876

208.461098

3200

0.100362

261.1984616

0.125675

208.5888204

4000

0.125614

260.8626427

0.150206

218.1537355

8000

0.238237

275.087413

0.305275

214.6785685

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