Hi,
I have done performance tests recently for FreeRtos/Lwip running on
MPC52259 eval board 80Mhz and on my own LPC2468 72Mhz. Both boards
show quite similar results . The test was netio tcp network benchmark.
I have got ~ 900kB/s for receiving and 1200kB/s for transmitting.
Speed was lower for small packets (less then 1024 bytes).
The most sensitive lwipopts settings I found were:
TCP_WND
TCP_SND_BUF
MEM_SIZE
TCP_MSS
Also I had big improvement when I set network frame buffers size equal
to MTU. TCP_SND_BUF improves transmission speed when it is more then
2 times of mss. Here are my optimal settings for lwipopts:
#define MEM_SIZE 6 * 1024
/* TCP receive window. */
#define TCP_WND 3000
/* TCP Maximum segment size. */
#define TCP_MSS 1460
/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF 3000
Regards, Dmitri.
>Hi All,
>I use lwiP on GPRS channel. I just find the send/recieve is a bit slow
with lwIP. I use the lwIP replace platform TCP/IP stac, and lwIP is much
stable in GPRS >environement. but a little slow.
>
>I hard to make detailed debug on GPRS channel. If there any known
paramter could be adjusted to increase the send performance.
>
>Is there any check list for me to known where is the problems comes from?
>
>Sorry to i give imcomplete information.
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