Hi: I am working on LWIP1.4.0 and FreeRTOSv7.1.1 to setup web server with SOCKET API..and found that sending speed becomes lower. In order to know the actual sending speed, I write a simple application to test it. And found that the sending speed is up to 8Mb/s. it is high enough for me. I notice that the application only setup connection one times. In web server, it closed connection after sending all data out. I do n't know if it may cause system Performance down. I extend the sending buffer as I can. They are following:
#define TCP_MSS (1500 - 40) /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */ /* TCP sender buffer space (bytes). */ #define TCP_SND_BUF (8*TCP_MSS) /* TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */ #define TCP_SND_QUEUELEN (4* TCP_SND_BUF/TCP_MSS) /* TCP receive window. */ #define TCP_WND (4*TCP_MSS) /* ---------- Pbuf options ---------- */ /* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */ #define PBUF_POOL_SIZE 10 /* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */ #define PBUF_POOL_BUFSIZE 1024 /* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments. */ #define MEMP_NUM_TCP_SEG 64 /* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections. */ #define MEMP_NUM_TCP_PCB 32 /* MEM_SIZE: the size of the heap memory. If the application will send a lot of data that needs to be copied, this should be set high. */ #define MEM_SIZE (12*1024) /* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application sends a lot of data out of ROM (or other static memory), this should be set high. */ #define MEMP_NUM_PBUF 64 Those value is enough big for me....but why do I get better performance ? vincent
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