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can you offer me the speed limit of RTX Tcp/ip stack ?

Thomas King

i am devoloping with arm7,and using tcp/ip

(TcpNet) ,but i get a very low speed when

communicating with pc;

i don't know whether there is a speed limit of the

tcp/ip stack, will you share me with the debugged

speed limit ?

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  • 0 in reply to Drew Davis

    A normal speed when uploading files with TFTP_demo example is up to 100 KBytes/second. This depends on the cpu clock speed. A speed of 100 kB/s has been measured with 96MHz cpu clock on ARM7 core. You should have in mind that there has been executed several memcpy() to store incomming data into a file on RAM file system.

    A Debug version reduces the speed of TCPnet because of 2 reasons:
    - it uses printf
    - it uses a polling method for a debug serial transmit

    To reach a full speed you should disable a debug and use as less of memcpy() as possible. If you still need a debug version, then you should modify the sendchar() function to use transmit interrupts.

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  • 0 in reply to Drew Davis

    A normal speed when uploading files with TFTP_demo example is up to 100 KBytes/second. This depends on the cpu clock speed. A speed of 100 kB/s has been measured with 96MHz cpu clock on ARM7 core. You should have in mind that there has been executed several memcpy() to store incomming data into a file on RAM file system.

    A Debug version reduces the speed of TCPnet because of 2 reasons:
    - it uses printf
    - it uses a polling method for a debug serial transmit

    To reach a full speed you should disable a debug and use as less of memcpy() as possible. If you still need a debug version, then you should modify the sendchar() function to use transmit interrupts.

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