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the BSD tcp/ip on ea2468


i want to use the BSD tcp/ip on my board,cpu lpc2468
RAM:1MB
why the eth speed is so slowly?
is the problem of small ram? or the slow speed cpu?
follow is running the nc_test_slave.c results:

master
UDP send - 81 bufs of 1024 bytes in 66.23 seconds - 1.22 KB/S - 0.0100
Mbit/S (M = 10^6), 10 lost, 57 out of sequence
Start UDP recv [640,1024] - no delays
UDP recv - 640 bufs of 1024 bytes in 0.05 seconds - 12800.00 KB/S - 104.8576
Mbit/S (M = 10^6)
   slave sent 0, recvd 3
Start TCP echo [640,1024] - no delays
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