Re: [lwip-users] tcp_sndbuf return 0 when sending file

[vincent cui]

Hi :

 

I use latest LWIP1.4.x from git repo, and found that the problem of receive speed down after sending file 3 times.

My code is pasted as following .

My system is FreeRTOS + lwip, I think it may be lwip bug

 

 

static void close_conn(struct tcp_pcb *pcb)

{

      tcp_arg(pcb, NULL);

      tcp_sent(pcb, NULL);

      tcp_recv(pcb, NULL);

      tcp_close(pcb);

}

 

static err_t server_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)

{

 

    if (err == ERR_OK && p != NULL)

    { 

        tcp_recved(pcb, tot_len); 

        pbuf_free(p);

    } 

 

      if (err == ERR_OK && p == NULL) {

            close_conn(pcb);

      }

      return ERR_OK;

}

 

static err_t server_accept(void *arg, struct tcp_pcb *pcb, err_t err){

      LWIP_UNUSED_ARG(arg);

      LWIP_UNUSED_ARG(err);

  

      tcp_recv(pcb, server_recv);

      tcp_err(pcb, NULL);

      tcp_sent(pcb, NULL);

      tcp_poll(pcb, NULL, 0);

      return ERR_OK;

}

 

static void server_init(void) 

{ 

    struct tcp_pcb *pcb; 

 

    pcb = tcp_new(); 

    tcp_bind(pcb, IP_ADDR_ANY, 8081);

    pcb = tcp_listen(pcb);

 

    tcp_accept(pcb, server_accept);    

 

    for (;;)

    {

        vTaskDelay(50);

    }

}

 

 

From: lwip-users-bounces+address@hidden [mailto:lwip-users-bounces+address@hidden On Behalf Of Bill Auerbach
Sent: 2012年4月13日 22:16
To: 'Mailing list for lwIP users'
Subject: Re: [lwip-users] tcp_sndbuf return 0 when sending file

 

>I use LWIP 1.3.2, after server receive a lot of data packet from client for a while .

>The system performance is lower, anyone know how to perfact it ?

 

I would use lwIP 1.4.1.  Why spend all this time developing and testing on something already out of date with known problems fixed in later versions?

 

Bill