RE:RE: HTTP Server traffic

Hi Kieran,
 
here is my lwipopts.h file.
 
/* ---------- 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 3200
/* 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
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
per active UDP "connection". */
#define MEMP_NUM_UDP_PCB 4
/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
connections. */
#define MEMP_NUM_TCP_PCB 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 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 4
/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#define PBUF_POOL_BUFSIZE 1500
/* 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 4000//1500
/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF 4000//1500
/* 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
/* TCP receive window. */
#define TCP_WND 1500
/* 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
/* 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
#endif /* __LWIPOPTS_H__ */
 
 
i hope there is something to be done about the low performance i am seeing.
 
best regards, 
Martin B.

---

> Subject: Re: [lwip-users] HTTP Server traffic
> From: kieran@xxxxxxxxxx
> To: lwip-users-qX2TKyscuCcdnm+yROfE0A@xxxxxxxxxxxxxxxx
> Date: Mon, 4 Dec 2006 16:50:09 +0000
> 
> 
> > So my question is, how do i make my communication between, my
> > embedded target and the PC client run as smoothly as running
> > the website
> > on a PC webserver ?
> > Is that even possible with lwip ?
> 
> My guess is that you've configured lwIP with too small a TCP_SND_BUF or
> TCP_SND_QUEUELEN and this is interacting badly with the delayed ACK
> algorithm. Could you post your lwipopts.h configuration file?
> 
> Kieran
> 
> 
> 
> _______________________________________________
> lwip-users mailing list
> lwip-users@xxxxxxxxxx
> http://lists.nongnu.org/mailman/listinfo/lwip-users

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