Slow FTP on M52259DEMO board

[JDR]

I am running the coldfire sample project called hvac_m52259demo.mcp on the M52259DEMO board.  When I use FTP for downloading files from the USB stick connected to the board to my PC the transfer speed is around 2.5 kB/s.  Are such low speeds normal?

I have been able to increase the speed by increasing FTPd_buffer_size in RTCS.c from 536 to 24*536 but the transfer speed is still not higher than 45kB/s even for large files.  What kind of speeds can I expect from the M5229DEMO board ethernet port?

I have also implemented a loop that continously feeds characters to the telnet socket.  The transmission is slow compared to letting the same loop feed out characters to the serial UART.

[JDR]

I have tried increasing the window size by setting  FTPd_window_size=4*1024  but it has no effect.  The only thing that I have found to increase transmission speed is increasing FTPd_buffer_size but the DEMO board has no external RAM so the buffer size is limited to fit in the 64kB of on chip SRAM.

[TomFreescale]

Hi,

If you only have 64k of memory, what is considered a large file?

What other resources are you using? For example are you running a web server and

any other tcp connections?

How much free ram is left with your current configuration?

[JDR]

I have stored a file of 4MByte size on the USB pin that i download to my PC using FTP. In the hvac.h file of the HVAC demo project I have disabled everything except USB filesystem, RTCS and FTP server.

#define DEMOCFG_ENABLE_SERIAL_SHELL       0  

#define DEMOCFG_ENABLE_SWITCH_TASK      0  

#define DEMOCFG_ENABLE_AUTO_LOGGING     0  
#define DEMOCFG_ENABLE_USB_FILESYSTEM  1  

#define DEMOCFG_ENABLE_RTCS                   1  

#define DEMOCFG_ENABLE_FTP_SERVER         1  

#define DEMOCFG_ENABLE_TELNET_SERVER    0  

#define DEMOCFG_ENABLE_KLOG                   0  

#define DEMOCFG_USE_POOLS                     0  

[mo_tron]

Did you increase your speed?  If so, how?

[JDR]

How can I find out if TCP windowing is enabled? If it is not, how do I enable it?

[mjbcswitzerland]

Hi

This depends on the package that you are using. Some will support it and others won't.

Unfortunately I don't know the one you are trying with so I would study first the package documentation and contact SW support if you still don't make any progress.

Regards

Mark

[Nouchi]

Hi,

 I don't know if could be useful with MQX RTOS, but I found something called FTPDCFG_WINDOW_SIZE in rtcscfg.h. It may be a clue..........

Emmanuel

[mjbcswitzerland]

Hi

Check whether TCP windowing is enabled in the TCP stack since otherwise transfers from a board to a PC will generally be quite slow. This is due to the PC's delayed ack operation which effectively limits throughput to about 6k bytes a second.

See the following for more details and practical speeds to be achieved:

http://www.utasker.com/forum/index.php?topic=396.0

Regards

Mark