topic Re: Slow FTP on M52259DEMO board in ColdFire/68K Microcontrollers and Processors

Slow FTP on M52259DEMO board

JDR — Thu, 11 Jun 2009 01:31:42 GMT

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.

Re: Slow FTP on M52259DEMO board

mjbcswitzerland — Thu, 11 Jun 2009 01:38:55 GMT

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

Re: Slow FTP on M52259DEMO board

JDR — Thu, 11 Jun 2009 15:56:45 GMT

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

Re: Slow FTP on M52259DEMO board

mjbcswitzerland — Thu, 11 Jun 2009 19:08:29 GMT

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

Re: Slow FTP on M52259DEMO board

Nouchi — Fri, 12 Jun 2009 13:31:57 GMT

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

Re: Slow FTP on M52259DEMO board

JDR — Fri, 12 Jun 2009 15:51:14 GMT

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.

Re: Slow FTP on M52259DEMO board

TomFreescale — Sat, 13 Jun 2009 00:04:47 GMT

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?

Re: Slow FTP on M52259DEMO board

JDR — Mon, 15 Jun 2009 15:42:05 GMT

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

Re: Slow FTP on M52259DEMO board

mo_tron — Mon, 15 Jun 2009 20:40:16 GMT

Did you increase your speed? If so, how?