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TCP/IP stack performance


Hi,
      I am working on AT91RM9200 board.  The TCP/IP stack is working
perfectly fine with this board.
     But the problem is that at times the ping reply is taking very
long(some 3 to 4 seconds) which usually will be only 2 or 3ms and is also
timing out in between when it is taking long time to reply back. But the
good thing is that 
the TCP/IP stack is not dying completely and is slowly resuming back to
normal after some time( that is it is getting the ping reply within 2 t0 3
ms).
      Why is this happening and is there any way that the performance can be
improved?
     Anyone suggestions regrading this could be of great help.

Thanks & Regards,
Neeraja.
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