Re: [lwip-users] Long Latency Time

[Martin Velek]

Hello,

I cannot help you but I can give you an advice. What about to attach a
tcpdump/wireshark log (not a screenshot)? And setup debug in LWIP?

Best
Martin

On Wed, Dec 12, 2012 at 3:12 PM, pv33 <address@hidden> wrote:
> Hi,
>
> On lwip 1.4, FreeRTOS 7.1.1, we have written a web server. The main part is
>
> static void http_server_netconn_thread(void *arg)
> {
>   struct netconn *conn, *newconn;
>   err_t err;
>
>   /* Create a new TCP connection handle */
>   conn = netconn_new(NETCONN_TCP);
>
>   if (conn!= NULL)
>   {
>     /* Bind to port 80 (HTTP) with default IP address */
>     err = netconn_bind(conn, NULL, 8002);
>
>     if (err == ERR_OK)
>     {
>       /* Put the connection into LISTEN state */
>       netconn_listen(conn);
>
>       while(1)
>       {
>         /* accept any icoming connection */
>         err = netconn_accept(conn, &newconn);
>
>         if( err == ERR_OK )
>         {
>             /* serve connection */
>             http_server_serve(newconn);
>
>             /* delete connection */
>             netconn_delete(newconn);
>         }
>       }
>     }
>     else
>     {
>       printf("can not bind netconn");
>     }
>   }
>   else
>   {
>     printf("can not create netconn");
>   }
> }
>
> Every 2 seconds our server receives a request for a CRC value and if the
> value is changed
> a following request for a BMP picture which comes with a minimal delay after
> a CRC request.
> .
> We have found in Safari browser in Develop->Network logs:
> http://www.freeimagehosting.net/9aumg
> that there is a latency time for a reply on CRC request about 200 ms which
> seems to be very long.
> But if the server receives a second request, for a BMP file, in less than 10
> ms, the latency time of the second request is only
> about 5 ms.
>
> Please, could anyone let us know how could we improve latency time of
> requests of  CRC values?
>
> Thanks for any help and suggestion,
>
> Pavel
> .
>
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