[lwip-users] why my tcp so slow

[乔崇]

I use lwip 0.6.4.
The udp run very well about 500KB/s,but the tcp will block soon after a 
transmission,about one minitute after it can
continue transmit serval seconds and then block again.
I do not know if my config is correct,the my lwipopts.h is as bellow.
Who can help me?
Thank you very much!
//my lwipopts.h
/*
 * Copyright (c) 2001, 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. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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>
 *
 * $Id: lwipopts.h,v 1.1.1.1 2003/05/17 05:06:57 chenyu Exp $
 */
#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__
#include "common.h"

#define DBG_MIN_LEVEL 0
#define LWIP_COMPAT_SOCKETS 1
#define TAPIF_DEBUG DBG_ON
#define TUNIF_DEBUG DBG_OFF
#define UNIXIF_DEBUG DBG_OFF
#define DELIF_DEBUG DBG_OFF
#define SIO_FIFO_DEBUG DBG_OFF
#define TCPDUMP_DEBUG DBG_ON
#define PPP_DEBUG               DBG_ON
#if 1
#define MEM_DEBUG               DBG_ON
#define MEMP_DEBUG              DBG_ON
#define PBUF_DEBUG              DBG_ON
#define API_LIB_DEBUG   DBG_ON
#define API_MSG_DEBUG   DBG_ON
#define TCPIP_DEBUG             DBG_ON
#define NETIF_DEBUG             DBG_ON
#define SOCKETS_DEBUG   DBG_ON
#define DEMO_DEBUG              DBG_ON
#define IP_DEBUG                DBG_ON
#define IP_REASS_DEBUG  DBG_ON
#define ICMP_DEBUG              DBG_ON
#define UDP_DEBUG               DBG_ON
#define TCP_DEBUG               DBG_ON
#define TCP_INPUT_DEBUG         DBG_ON
#define TCP_OUTPUT_DEBUG        DBG_ON
#define TCP_RTO_DEBUG   DBG_ON
#define TCP_CWND_DEBUG  DBG_ON
#define TCP_WND_DEBUG   DBG_ON
#define TCP_FR_DEBUG    DBG_ON
#define TCP_QLEN_DEBUG  DBG_ON
#define TCP_RST_DEBUG   DBG_ON
#endif

#define DBG_TYPES_ON    (DBG_ON|DBG_TRACE|DBG_STATE|DBG_FRESH|DBG_HALT)
/* ---------- 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. */
//yangye 2003-1-27
#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                10240

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


/* 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         MY_MAX_TASKS*2
/* MEMP_NUM_NETCONN: the number of struct netconns. */
#define MEMP_NUM_NETCONN        MY_MAX_TASKS
/* 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        MY_MAX_TASKS
/* 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      100


/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
//yangye 2003-1-22
//seems there is something wrong when PBUF_POOL_SIZE = 6
#define PBUF_POOL_SIZE          256

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#define PBUF_POOL_BUFSIZE       256

/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
   link level header. */
#define PBUF_LINK_HLEN          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                 512

/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF             1024

/* 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                 4096

/* 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
/**
 * - If enabled, cache entries are generated for every kind of ARP traffic or
 * broadcast IP traffic. This enhances behaviour for sending to a dynamic set
 * of hosts, for example if acting as a gateway.
 * - If disabled, cache entries are generated only for IP destination addresses
 * in use by lwIP or applications. This enhances performance if sending to a 
small,
 * reasonably static number of hosts. Typically for embedded devices.
 */
#define ETHARP_ALWAYS_INSERT 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
#define IP_FRAG           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
#define IP_STATS
#define ICMP_STATS
#define UDP_STATS
#define TCP_STATS
#define MEM_STATS
#define MEMP_STATS
#define PBUF_STATS
#define SYS_STATS
#endif /* STATS */


/* ---------- PPP options ---------- */

#define PPP_SUPPORT      0      /* Set > 0 for PPP */

#if PPP_SUPPORT > 0

#define NUM_PPP 1           /* Max PPP sessions. */


/* Select modules to enable.  Ideally these would be set in the makefile but
 * we're limited by the command line length so you need to modify the settings
 * in this file.
 */
#define PAP_SUPPORT      1      /* Set > 0 for PAP. */
#define CHAP_SUPPORT     1      /* Set > 0 for CHAP. */
#define MSCHAP_SUPPORT   0      /* Set > 0 for MSCHAP (NOT FUNCTIONAL!) */
#define CBCP_SUPPORT     0      /* Set > 0 for CBCP (NOT FUNCTIONAL!) */
#define CCP_SUPPORT      0      /* Set > 0 for CCP (NOT FUNCTIONAL!) */
#define VJ_SUPPORT       1      /* Set > 0 for VJ header compression. */
#define MD5_SUPPORT      1      /* Set > 0 for MD5 (see also CHAP) */


/*
 * Timeouts.
 */
#define FSM_DEFTIMEOUT          6       /* Timeout time in seconds */
#define FSM_DEFMAXTERMREQS      2       /* Maximum Terminate-Request 
transmissions */
#define FSM_DEFMAXCONFREQS      10      /* Maximum Configure-Request 
transmissions */
#define FSM_DEFMAXNAKLOOPS      5       /* Maximum number of nak loops */

#define UPAP_DEFTIMEOUT         6       /* Timeout (seconds) for retransmitting 
req */
#define UPAP_DEFREQTIME         30      /* Time to wait for auth-req from peer 
*/

#define CHAP_DEFTIMEOUT         6       /* Timeout time in seconds */
#define CHAP_DEFTRANSMITS       10      /* max # times to send challenge */


/* Interval in seconds between keepalive echo requests, 0 to disable. */
#if 1
#define LCP_ECHOINTERVAL 0
#else
#define LCP_ECHOINTERVAL 10
#endif

/* Number of unanswered echo requests before failure. */
#define LCP_MAXECHOFAILS 3

/* Max Xmit idle time (in jiffies) before resend flag char. */
#define PPP_MAXIDLEFLAG 100

/*
 * Packet sizes
 *
 * Note - lcp shouldn't be allowed to negotiate stuff outside these
 *    limits.  See lcp.h in the pppd directory.
 * (XXX - these constants should simply be shared by lcp.c instead
 *    of living in lcp.h)
 */
#define PPP_MTU     1500     /* Default MTU (size of Info field) */
#if 0
#define PPP_MAXMTU  65535 - (PPP_HDRLEN + PPP_FCSLEN)
#else
#define PPP_MAXMTU  1500 /* Largest MTU we allow */
#endif
#define PPP_MINMTU  64
#define PPP_MRU     1500     /* default MRU = max length of info field */
#define PPP_MAXMRU  1500     /* Largest MRU we allow */
#define PPP_DEFMRU      296             /* Try for this */
#define PPP_MINMRU      128             /* No MRUs below this */


#define MAXNAMELEN      256     /* max length of hostname or name for auth */
#define MAXSECRETLEN    256     /* max length of password or secret */

#endif /* PPP_SUPPORT > 0 */
#define SYS_LIGHTWEIGHT_PROT 1

#define MYS(p) ((unsigned short *)p)
#define MYL(p) ((unsigned int)((MYS(p)[1]<<16)|MYS(p)[0]))

#endif /* __LWIPOPTS_H__ */


address@hidden
　　　　　　　　　　2003-11-05