Writing big file failed when using usb gadget g_file_storage module

Dear all:
 When I use the g_file_strogae.ko module, I failed to write big file to
the disk.
Hardware platform:
CPU: S3C2440A
SDRAM: 32M sdram
Kernel:2.6.21.3 with s3c2410_udc patch
<http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-03-usb/usb-gadget-driver-for-samsung-s3c2410-arm-soc.patch>

I plug a 256MBytes usb flashdisk(fat32 type) into the board usb host
interface, and connect a usb line between the board usb device interface
and a PC with WinXP OS.
In the board side, I use the following command:
#> insmod ./g_file_storage.ko file=/dev/sda removable=1
where /dev/sda is the external 256MB flash disk.
Then in the PC side, XP can recognize the board as a usb mass storage
device. And read big file(3Mbytes) is OK.
But when I write a big file(3Mbytes) into the board from XP side, the
speed is very slow and finally failed. (Write a 3KBytes file is OK). In
the board side, kernel repeatedly printed following message every
several seconds. "g_file_storage gadget: full speed config #1".
What's wrong with it?

Thanks

Lonsn

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