In TCP, I don't think there is an ACK for each
packet:
Take a look at the beginning of the tx, is. no.12 for 2048 payload and
no. 18 for 100payload. 2048 sends out one packe of 1460 and waits.
100payload sends out two packets, 100 bytes, and 700 immediately, without
waiting for tha ACK from PC for the first packet
>>>>>>>>>>>>>>>>>>>>
lwipopts.h >>>>>>>>>>>>>
#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__
/* Include user defined options first */
// #include "conf_eth.h"
#include "conf_lwip_threads.h"
#include "lwip/debug.h"
/* Define default values for unconfigured parameters. */
#define LWIP_NOASSERT 1 // To suppress some errors for now (no debug
output)
/* These two control is reclaimer functions should be compiled
in. Should always be turned on (1). */
#define
MEM_RECLAIM
1
#define
MEMP_RECLAIM
1
/* Platform specific locking */
/*
* enable SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task
protection
* for certain critical regions during buffer allocation,
deallocation and memory
* allocation and deallocation.
*/
#define
SYS_LIGHTWEIGHT_PROT
1
/* ---------- 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
3 * 1024
/* 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
6
/* Number of raw connection PCBs */
#define
MEMP_NUM_RAW_PCB
1
#if (TFTP_USED == 1)
/* ---------- UDP options ---------- */
#define
LWIP_UDP
1
#define
UDP_TTL
255
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks.
One
per active UDP "connection".
*/
#define MEMP_NUM_UDP_PCB
2
#else
/* ---------- UDP options ---------- */
#define
LWIP_UDP
0
#define
UDP_TTL
0
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks.
One
per active UDP "connection".
*/
#define MEMP_NUM_UDP_PCB
0
#endif
/* MEMP_NUM_TCP_PCB: the number of simultaneously active TCP connections.
*/
#define MEMP_NUM_TCP_PCB
2
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
*/
#define MEMP_NUM_TCP_PCB_LISTEN 1
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
*/
#define MEMP_NUM_TCP_SEG
9
/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active timeouts.
*/
#define MEMP_NUM_SYS_TIMEOUT 6
/* 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
3
/* MEMP_NUM_NETCONN: the number of struct netconns. */
#define MEMP_NUM_NETCONN
4
/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
#define
PBUF_POOL_SIZE
6
/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool.
*/
#define PBUF_POOL_BUFSIZE
500
/* 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
/* TCP receive window. */
#define
TCP_WND
1500
/* 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
1500
/* TCP sender buffer space (bytes). */
#define
TCP_SND_BUF
2150
/* 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 *
TCP_SND_BUF/TCP_MSS
/* Maximum number of retransmissions of data segments. */
#define
TCP_MAXRTX
12
/* Maximum number of retransmissions of SYN segments. */
#define
TCP_SYNMAXRTX
4
/**
* DEFAULT_RAW_RECVMBOX_SIZE: The mailbox size for the incoming
packets on a
* NETCONN_RAW. The queue size value itself is platform-dependent,
but is passed
* to sys_mbox_new() when the recvmbox is created.
*/
#define DEFAULT_RAW_RECVMBOX_SIZE
6
/**
* DEFAULT_UDP_RECVMBOX_SIZE: The mailbox size for the incoming
packets on a
* NETCONN_UDP. The queue size value itself is platform-dependent,
but is passed
* to sys_mbox_new() when the recvmbox is created.
*/
#define DEFAULT_UDP_RECVMBOX_SIZE
6
/**
* DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming
packets on a
* NETCONN_TCP. The queue size value itself is platform-dependent,
but is passed
* to sys_mbox_new() when the recvmbox is created.
*/
#define DEFAULT_TCP_RECVMBOX_SIZE
6
/**
* DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming
connections.
* The queue size value itself is platform-dependent, but is passed
to
* sys_mbox_new() when the acceptmbox is created.
*/
#define
DEFAULT_ACCEPTMBOX_SIZE
6
/* ---------- 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
/* 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
/* ---------- 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
1
/* 1 if you want to do an ARP check on the offered address
(recommended). */
//#define DHCP_DOES_ARP_CHECK 1
/*
------------------------------------
---------- Thread options ----------
------------------------------------
*/
/**
* TCPIP_THREAD_NAME: The name assigned to the main tcpip
thread.
*/
#define
TCPIP_THREAD_NAME
"TCP/IP"
/**
* TCPIP_THREAD_STACKSIZE: The stack size used by the main tcpip
thread.
* The stack size value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
TCPIP_THREAD_STACKSIZE
lwipINTERFACE_STACK_SIZE
/**
* TCPIP_THREAD_PRIO: The priority assigned to the main tcpip
thread.
* The priority value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
TCPIP_THREAD_PRIO
lwipINTERFACE_TASK_PRIORITY
/**
* TCPIP_MBOX_SIZE: The mailbox size for the tcpip thread
messages
* The queue size value itself is platform-dependent, but is passed
to
* sys_mbox_new() when tcpip_init is called.
*/
#define
TCPIP_MBOX_SIZE
6
/**
* SLIPIF_THREAD_NAME: The name assigned to the slipif_loop
thread.
*/
#define
SLIPIF_THREAD_NAME
"slipif"
/**
* SLIP_THREAD_STACKSIZE: The stack size used by the slipif_loop
thread.
* The stack size value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
SLIPIF_THREAD_STACKSIZE
configMINIMAL_STACK_SIZE
/**
* SLIPIF_THREAD_PRIO: The priority assigned to the slipif_loop
thread.
* The priority value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
SLIPIF_THREAD_PRIO
1
/**
* PPP_THREAD_NAME: The name assigned to the pppMain thread.
*/
#define
PPP_THREAD_NAME
"pppMain"
/**
* PPP_THREAD_STACKSIZE: The stack size used by the pppMain
thread.
* The stack size value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
PPP_THREAD_STACKSIZE
configMINIMAL_STACK_SIZE
/**
* PPP_THREAD_PRIO: The priority assigned to the pppMain
thread.
* The priority value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
PPP_THREAD_PRIO
1
/**
* DEFAULT_THREAD_NAME: The name assigned to any other lwIP
thread.
*/
#define
DEFAULT_THREAD_NAME
"lwIP"
/**
* DEFAULT_THREAD_STACKSIZE: The stack size used by any other lwIP
thread.
* The stack size value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
DEFAULT_THREAD_STACKSIZE
configMINIMAL_STACK_SIZE
/**
* DEFAULT_THREAD_PRIO: The priority assigned to any other lwIP
thread.
* The priority value itself is platform-dependent, but is passed
to
* sys_thread_new() when the thread is created.
*/
#define
DEFAULT_THREAD_PRIO
1
The reason the 2048-byte payload one is going so slowly is because
it's
waiting for the ACK from the other end before sending each packet.
The
other end is delaying ACKs (as it should) and so there is a big gap
between packets. Normally this indicates too small a TCP window or
send
queue. Can you show us your lwipopts.h settings?
When sending lots of small packets it's not a problem because you
get
lots of ACKs back, and so it doesn't wait as long.