Hi :
I enable LWIP_STAT to get LWIP status when performance goes down. but it seems
no error detected …
Anyone help to have a look ?
ETHARP
xmit: 2
recv: 761
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 1750
IP
xmit: 1753
recv: 1971
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
TCP
xmit: 1
recv: 1757
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
MEM HEAP
avail: 12288
used: 1676
max: 1760
err: 0
MEM RAW_PCB
avail: 4
used: 0
max: 0
err: 0
MEM UDP_PCB
avail: 6
used: 1
max: 2
err: 0
MEM TCP_PCB
avail: 16
used: 1
max: 2
err: 0
MEM TCP_PCB_LISTEN
avail: 6
used: 4
max: 4
err: 0
MEM TCP_SEG
avail: 32
used: 0
max: 1
err: 0
MEM NETBUF
avail: 2
used: 0
max: 0
err: 0
MEM NETCONN
avail: 8
used: 2
max: 2
err: 0
MEM TCPIP_MSG_API
avail: 8
used: 0
max: 0
err: 0
MEM TCPIP_MSG_INPKT
avail: 8
used: 1
max: 1
err: 0
MEM SYS_TIMEOUT
avail: 10
used: 6
max: 6
err: 0
MEM SNMP_ROOTNODE
avail: 30
used: 0
max: 0
err: 0
MEM SNMP_NODE
avail: 50
used: 0
max: 0
err: 0
MEM SNMP_VARBIND
avail: 2
used: 0
max: 0
err: 0
MEM SNMP_VALUE
avail: 3
used: 0
max: 0
err: 0
MEM PBUF_REF/ROM
avail: 16
used: 0
max: 0
err: 0
MEM PBUF_POOL
avail: 10
used: 2
max: 2
err: 0
From: [email protected]
[mailto:[email protected]] On Behalf Of
vincent cui
Sent: 2012年5月15日 21:31
To: Mailing list for lwIP users
Subject: [lwip-users] lwip whole performance down
Hi:
I am working on LWIP1.4.0 and FreeRTOSv7.1.1 to setup web server with SOCKET
API..and found that sending speed becomes lower.
In order to know the actual sending speed, I write a simple application to test
it. And found that the sending speed is up to 8Mb/s. it is high enough for me.
I notice that the application only setup connection one times. In web server,
it closed connection after sending all data out. I do n’t know if it may cause
system
Performance down. I extend the sending buffer as I can. They are following:
#define TCP_MSS (1500 - 40) /* TCP_MSS = (Ethernet MTU - IP
header size - TCP header size) */
/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF (8*TCP_MSS)
/* TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */
#define TCP_SND_QUEUELEN (4* TCP_SND_BUF/TCP_MSS)
/* TCP receive window. */
#define TCP_WND (4*TCP_MSS)
/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
#define PBUF_POOL_SIZE 10
/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#define PBUF_POOL_BUFSIZE 1024
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
segments. */
#define MEMP_NUM_TCP_SEG 64
/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
connections. */
#define MEMP_NUM_TCP_PCB 32
/* 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 (12*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 64
Those value is enough big for me….but why do I get better performance ?
vincent
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