[lwip-users] Re: lwip-users Digest, Vol 67, Issue 11

[Chen]

Sorry, but I think those 1.3... are not of lwIP 
:(

Do I simply replace all the files in lwIP with the latest? Or there is a
better way to do it?

If I understand you correctly, I should be able to use
#define
PBUF_POOL_SIZE         
60
#define
TCP_SND_BUF            
30000

60x500=30000

but with these settings, I can't even connect to lwIP
using telnet

Please see the capture on
http://www.dataq.com/chen/pbuf_pool_size60.cap

Lowering PBUF_POOL_SIZE to 40
allows connection. Also the default was
#define
PBUF_POOL_SIZE 6 and
#define
TCP_SND_BUF 2150, and 6x500>2150

Do I miss something else here?

Thanks 

>>>>>>>>>>>>>>>
Chen schrieb:

    I believe it is 1.3 since the soure codes have many
reference for 1.3.6.1.2.1.xx (which definition should I search to be
absolutely sure?) 

1.3.6.1.2.1.xx??? Where's that from? Unfortunately, there is still no
version in the sources. It's a new "feature" just added in CVS
HEAD.


    Where to acquire the latest? 

http://savannah.nongnu.org/projects/lwip/
-> Download



> I am confused:
>
*> "#define* PBUF_POOL_BUFSIZE 500" is not the packet size (I can see packet of 1460 bytes from Wireshark), how does it affect the tx buffer?

Each buffer is 500 bytes long. A packet of 1460 bytes TCP data (plus some headers, 1514 bytes totally) is thus made up of 4 pbufs from the pool *if* these are used. For transmitting, PBUF_RAM is used, which is allocated from the heap, the size of which is define with the define MEM_SIZE (in bytes).

Simon