Hi, I'm having problem setting a proper values for the following #defines
#define MEM_SIZE (24 * 1024) #define MEMP_NUM_PBUF 16 #define MEMP_NUM_TCP_PCB 8 #define MEMP_NUM_TCP_SEG 16 #define PBUF_POOL_SIZE 16 #define TCP_WND (8 * 1024) #define TCP_MSS 1024 #define TCP_SND_BUF (8 * TCP_MSS) #define TCP_SND_QUEUELEN (MEMP_NUM_TCP_SEG) *4 #define PBUF_LINK_HLEN 16 #define PBUF_POOL_BUFSIZE 256 Which of the above are related to TCP Tx and which are Rx? How do I calculate those values to get an optimum throughput ? I'm using Luminary Micro LM3S6965 which got 64KB RAM. and I'm opening 2 TCP port transfering data to PC. PC <-------> MCU with lwIP 1.3 (2 TCP channel transfering data from 2xUART using 230Kbps). When I open only 1 TCP port and transfer the data, the transmission is fast and smooth. The problem is, when 2 TCP port are opened and device is connected to 10Mbps Hub both data transfer starting to slow down significantly and i can see the data transfer are starting and stopping. In my firmware, I got sometimes a) snd_queuelen was fulled on one of the port b) i got ERR_MEM on tcp_write most of the time c) snd_buf size become 0 or very low and never free up again. I'm sure my ethernet driver is NOT in promicuous mode. Am I setting those #define completely wrong? It would be great if you guys can give me suggestion or thoughts about what would causing me the issue. Thank you very much. -- Bandu [email protected]
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