[lwip-users] what is the suggest configure parameter

[yueyue papa]

Hi All,

I use lwIP+PPP in GPRS environment. I am still meet the response slow problem.  

The 80% time socket is used in this way

connect --> send --(1xx bytes) ---> receive (1xx bytes)---> disconnect.

What is suitable configureation for my case?

My current configuration is 
#####################
#define TCP_QUEUE_OOSEQ         0   

/* TCP Maximum segment size. */
#define TCP_MSS                 1024    

/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF             (TCP_MSS*4)  

/* TCP sender buffer space (pbufs). This must be at least = 2 *
   TCP_SND_BUF/TCP_MSS for things to work. */
#define TCP_SND_QUEUELEN       (4 * TCP_SND_BUF/TCP_MSS)

/* TCP writable space (bytes). This must be less than or equal
   to TCP_SND_BUF. It is the amount of space which must be
   available in the tcp snd_buf for select to return writable */
#define TCP_SNDLOWAT           (TCP_SND_BUF/2)

/* TCP receive window. */
#define TCP_WND                 (TCP_MSS*4) /*minye.li original is 2048*/
##########################

The slow is cause in send, but the peer has a long delay to get the data. I am unable to confirm where the long delay comes from.

Lee