Re: [lwip-users] I am facing issues with lwip140

[Anirudha Sarangi]

Hi,

Just to add. I tried lwip132 and I did not see any issues with that.

 

So changes between lwip132 and lwip140 are creating issues for me on the Tx side. The performance numbers are low and also the Tx side is not stable. At times the iperf even hangs.

My guess is there is some configuration which I might have missed (as I see lwip140 has so many new configuration parameters in opt.h).

 

Can anyone help me out?

 

Regards

Anirudha

 

From: Anirudha Sarangi
Sent: Thursday, June 30, 2011 10:07 AM
To: 'address@hidden'
Subject: I am facing issues with lwip140

 

Hi,

I have been using lwip130 since sometime. Recently I decided to upgrade to lwip140. I saw there are lots of new parameters added in opt.h. I did not try to understand them and thought to use it as default. Two changes I did, which are:

 

 

I used “LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT” as 1 (I am sure it does not have much effect on my configuration and usage)

I used “NO_SYS_NO_TIMERS” as 1

I used “LWIP_TIMERS” as 0.

 

With these few changes, when I tested lwip with iperf, on the Rx side performance numbers increased a bit (in comparision to lwip130), but on the Tx side, the numbers came down drastically (almost by 35%).

 

My question is, is there any special care I need to take for lwip140? I mean any special configuration?

 

My parameters as in lwipopts.h are listed below. Please note that with same configuration (except the few changes stated above) I get very good numbers with lwip130.

 

#define NO_SYS 1

#define LWIP_SOCKET 0

#define LWIP_COMPAT_SOCKETS 0

#define LWIP_NETCONN 0

 

#define MEM_ALIGNMENT 64

#define MEM_SIZE 131072

#define MEMP_NUM_PBUF 16

#define MEMP_NUM_UDP_PCB 4

#define MEMP_NUM_TCP_PCB 32

#define MEMP_NUM_TCP_PCB_LISTEN 8

#define MEMP_NUM_TCP_SEG 256

#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 1

 

#define MEMP_NUM_SYS_TIMEOUT 8

#define PBUF_POOL_SIZE 256

#define PBUF_POOL_BUFSIZE 1700

#define PBUF_LINK_HLEN 16

 

#define ARP_TABLE_SIZE 10

#define ARP_QUEUEING 1

 

#define ICMP_TTL 255

 

#define NO_SYS_NO_TIMERS 1

#define LWIP_TIMERS 0

 

#define IP_OPTIONS 0

#define IP_FORWARD 0

#define IP_REASSEMBLY 1

#define IP_FRAG 1

#define IP_REASS_BUFSIZE 5760

#define IP_FRAG_MAX_MTU 1500

#define IP_DEFAULT_TTL 255

#define LWIP_CHKSUM_ALGORITHM 3

 

#define LWIP_UDP 1

#define UDP_TTL 255

 

#define LWIP_TCP 1

#define TCP_SND_QUEUELEN   16 * TCP_SND_BUF/TCP_MSS

#define TCP_MSS 1460

#define TCP_SND_BUF 8192

#define TCP_WND 8192

#define TCP_TTL 255

#define TCP_MAXRTX 12

#define TCP_SYNMAXRTX 4

#define TCP_QUEUE_OOSEQ 1

#define CHECKSUM_GEN_TCP 0

#define CHECKSUM_GEN_UDP 0

#define CHECKSUM_GEN_IP 0

#define CHECKSUM_CHECK_TCP 0

#define CHECKSUM_CHECK_UDP 0

#define CHECKSUM_CHECK_IP 0

 

#define LWIP_DHCP 0

#define DHCP_DOES_ARP_CHECK false

 

#define CONFIG_LINKSPEED_AUTODETECT 1

 

Regards

Anirudha

This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.