[lwip-users] Re: Long(er) delay to PC ACK when serving images

[nopsoft]

Hi,

I turned on TF_NODELAY flag of pcb (however I use netconf API, lwIP-1.1.1) 
and my
packets are sent by TCP much much
faster. I use GPRS and PPP thus no delay is important and greatly improves
efficiency. But I noticed a bug :(
The bug is following:
I make connection to server (lwip client). After connection establishing is
made "dialog" with very short data frames. The dialog is very very slow
(lwip receive data very slow - PC computer do this much faster). In next
step I start to send data stream into server with maximum data rate which is
possible. Data transfer is a little slower than by compter (GPRS-PPP
connection to internet). And now I turn off the serwer. The link is failed
and it is ok.
After it I start the serwer again, client makes connection, and start to
send data as continuation to serwer without the "dialog". Serwer send frame
to client to inform him to stop the data stream but the client does not
receive it! Is it memory buffer problem? is it possible the lwIP cannot
allocate memory for segment?

lwipopts.h:
/*
 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
notice,
 *    this list of conditions and the following disclaimer in the
documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <address@hidden>
 *
 */
#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__

#define LWIP_NOASSERT  1 // To suppress some errors for now (no debug
output)
#define LWIP_PLATFORM_ASSERT(x) //kprintf(x"\n")

#define SYS_LIGHTWEIGHT_PROT            1

#define TCPIP_THREAD_PRIO 3

/* ---------- Memory options ---------- */
/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
   lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
   byte alignment -> define MEM_ALIGNMENT to 2. */
#define MEM_ALIGNMENT           4

/* 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                4000//2000

/* 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           20      //8//20
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
   per active UDP "connection". */
#define MEMP_NUM_UDP_PCB        4      //4
/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
   connections. */
#define MEMP_NUM_TCP_PCB        10      //2//10
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
   connections. */
#define MEMP_NUM_TCP_PCB_LISTEN 8
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
   segments. */
#define MEMP_NUM_TCP_SEG        8
/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
   timeouts. */
#define MEMP_NUM_SYS_TIMEOUT    5   //3


/* The following four are used only with the sequential API and can be
   set to 0 if the application only will use the raw API. */
/* MEMP_NUM_NETBUF: the number of struct netbufs. */
#define MEMP_NUM_NETBUF         4
/* MEMP_NUM_NETCONN: the number of struct netconns. */
#define MEMP_NUM_NETCONN        4
/* MEMP_NUM_APIMSG: the number of struct api_msg, used for
   communication between the TCP/IP stack and the sequential
   programs. */
#define MEMP_NUM_API_MSG        8
/* MEMP_NUM_TCPIPMSG: the number of struct tcpip_msg, which is used
   for sequential API communication and incoming packets. Used in
   src/api/tcpip.c. */
#define MEMP_NUM_TCPIP_MSG      8

/* These two control is reclaimer functions should be compiled
   in. Should always be turned on (1). */
#define MEM_RECLAIM             1
#define MEMP_RECLAIM            1

/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
#define PBUF_POOL_SIZE          16//4     //8//16

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#define PBUF_POOL_BUFSIZE       128//1500    //128//512

/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
   link level header. */
#define PBUF_LINK_HLEN          14//16

/* ---------- TCP options ---------- */
#define LWIP_TCP                1
#define TCP_TTL                 255

/* Controls if TCP should queue segments that arrive out of
   order. Define to 0 if your device is low on memory. */
#define TCP_QUEUE_OOSEQ         1

/* TCP Maximum segment size. */
#define TCP_MSS                 1460//*128//512//1500  //512

/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF             3000//*2048//512//1500  //512

/* TCP sender buffer space (pbufs). This must be at least = 2 *
   TCP_SND_BUF/TCP_MSS for things to work. */
#define TCP_SND_QUEUELEN        /*6*/4 * TCP_SND_BUF/TCP_MSS

/* TCP receive window. */
#define TCP_WND                 512//1500  //512

/* Maximum number of retransmissions of data segments. */
#define TCP_MAXRTX              12

/* Maximum number of retransmissions of SYN segments. */
#define TCP_SYNMAXRTX           4

/* ---------- ARP options ---------- */
#define ARP_TABLE_SIZE 10
#define ARP_QUEUEING 1

/* ---------- IP options ---------- */
/* Define IP_FORWARD to 1 if you wish to have the ability to forward
   IP packets across network interfaces. If you are going to run lwIP
   on a device with only one network interface, define this to 0. */
#define IP_FORWARD              0 // 1

/* If defined to 1, IP options are allowed (but not parsed). If
   defined to 0, all packets with IP options are dropped. */
#define IP_OPTIONS              1

/* ---------- ICMP options ---------- */
#define ICMP_TTL                255


/* ---------- DHCP options ---------- */
/* Define LWIP_DHCP to 1 if you want DHCP configuration of
   interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
   turning this on does currently not work. */
#define LWIP_DHCP               0

/* 1 if you want to do an ARP check on the offered address
   (recommended). */
#define DHCP_DOES_ARP_CHECK     1

/* ---------- UDP options ---------- */
#define LWIP_UDP                1
#define UDP_TTL                 255


/* ---------- Statistics options ---------- */
#define STATS

#ifdef STATS
#define LINK_STATS 1
#define IP_STATS   1
#define ICMP_STATS 1
#define UDP_STATS  1
#define TCP_STATS  1
#define MEM_STATS  1
#define MEMP_STATS 1
#define PBUF_STATS 1
#define SYS_STATS  1
#endif /* STATS */

#define LWIP_PROVIDE_ERRNO 1

//#define LWIP_EVENT_API

//moje wlasne dla PPP:
/* ---------- PPP options ---------- */

#define PPP_SUPPORT                     1      /* Set for PPP */

#if PPP_SUPPORT
#define PPP_THREAD_PRIO     4//2
#define NUM_PPP                         1      /* Max PPP sessions. */
#define PAP_SUPPORT                     1      /* Set for PAP. */
#define CHAP_SUPPORT                    0      /* Set for CHAP. */
#define MSCHAP_SUPPORT                  0      /* Set for MSCHAP (NOT
FUNCTIONAL!) */
#define CBCP_SUPPORT                    0      /* Set for CBCP (NOT
FUNCTIONAL!) */
#define CCP_SUPPORT                     0      /* Set for CCP (NOT
FUNCTIONAL!) */
#define VJ_SUPPORT                      0      /* Set for VJ header
compression. */
#define MD5_SUPPORT                     1      /* Set for MD5 (see also
CHAP) */
#define PPP_DEBUG      1
#endif

#define IP_REASSEMBLY           1 // IP fragments

#define LWIP_DEBUG
extern void kprintf(const char *format,...);
#define LWIP_PLATFORM_DIAG(x) kprintf x

#define DBG_TYPES_ON                    0xff
#define ETHARP_DEBUG                    DBG_OFF
#define NETIF_DEBUG                     DBG_OFF
#define PBUF_DEBUG                      DBG_OFF
#define API_LIB_DEBUG                   DBG_OFF
#define API_MSG_DEBUG                   DBG_OFF
#define SOCKETS_DEBUG                   DBG_OFF
#define ICMP_DEBUG                      DBG_OFF
#define INET_DEBUG                      DBG_OFF
#define IP_DEBUG                        DBG_OFF
#define IP_REASS_DEBUG                  DBG_OFF
#define RAW_DEBUG                       DBG_OFF
#define MEM_DEBUG                       DBG_OFF
#define MEMP_DEBUG                      DBG_OFF
#define SYS_DEBUG                       DBG_OFF
#define TCP_DEBUG                       DBG_ON
#define TCP_INPUT_DEBUG                 DBG_OFF
#define TCP_FR_DEBUG                    DBG_OFF
#define TCP_RTO_DEBUG                   DBG_OFF
#define TCP_REXMIT_DEBUG                DBG_OFF
#define TCP_CWND_DEBUG                  DBG_OFF
#define TCP_WND_DEBUG                   DBG_OFF
#define TCP_OUTPUT_DEBUG                DBG_OFF
#define TCP_RST_DEBUG                   DBG_OFF
#define TCP_QLEN_DEBUG                  DBG_OFF
#define UDP_DEBUG                       DBG_OFF
#define TCPIP_DEBUG                     DBG_OFF
#define DBG_MIN_LEVEL                   DBG_LEVEL_OFF

/*
#define DBG_TYPES_ON                    0
#define ETHARP_DEBUG                    DBG_OFF
#define NETIF_DEBUG                     DBG_OFF
#define PBUF_DEBUG                      DBG_OFF
#define API_LIB_DEBUG                   DBG_OFF
#define API_MSG_DEBUG                   DBG_OFF
#define SOCKETS_DEBUG                   DBG_OFF
#define ICMP_DEBUG                      DBG_OFF
#define INET_DEBUG                      DBG_OFF
#define IP_DEBUG                        DBG_OFF
#define IP_REASS_DEBUG                  DBG_OFF
#define RAW_DEBUG                       DBG_OFF
#define MEM_DEBUG                       DBG_OFF
#define MEMP_DEBUG                      DBG_OFF
#define SYS_DEBUG                       DBG_OFF
#define TCP_DEBUG                       DBG_OFF
#define TCP_INPUT_DEBUG                 DBG_OFF
#define TCP_FR_DEBUG                    DBG_OFF
#define TCP_RTO_DEBUG                   DBG_OFF
#define TCP_REXMIT_DEBUG                DBG_OFF
#define TCP_CWND_DEBUG                  DBG_OFF
#define TCP_WND_DEBUG                   DBG_OFF
#define TCP_OUTPUT_DEBUG                DBG_OFF
#define TCP_RST_DEBUG                   DBG_OFF
#define TCP_QLEN_DEBUG                  DBG_OFF
#define UDP_DEBUG                       DBG_OFF
#define TCPIP_DEBUG                     DBG_OFF
#define PPP_DEBUG                       DBG_OFF
#define SLIP_DEBUG                      DBG_OFF
#define DHCP_DEBUG                      DBG_OFF
#define DBG_MIN_LEVEL                   DBG_LEVEL_OFF
*/

#endif /* __LWIPOPTS_H__ */

best regards
Janusz U.