RE: [lwip-users] RAM-Usage

[Goldschmidt Simon]

> Hi!
> 
> I found out lwIP needs a bit too much RAM at my current 
> developement, i used a preconfigured sample project.
> So I tried to find the big RAM consumer and found out ip_frag 
> needs a lot of space.
> So I disabled fragmentation and reassemble in the lwipopts.h. 
> But this had no effect on RAM-consumption, ip_frag was built 
> anyway. I had to remove it manually from my Makefile. 
> Wouldn't it be good if there were a compilerswitch at the 
> files to not build them if not needed?

There is an '#if IP_FRAG || IP_REASS' in CVS HEAD, but I don't
propose to update since a lot has changed there and is probably
not yet as stable as 1.2.0.

> 
> In my Map file i found out mem, memp and pbuf also need much 
> ram, is there any way to tweak this?

You can tune the size of the heap through defining MEM_SIZE to
what you need in lwipopts.h. Memp size is dependent on numerous
options (MEMP_NUM_*). Again, the values depend on what you need.
Same for the pbuf pool (which moved to memp in CVS HEAD):
PBUF_POOL_SIZE and PBUF_POOL_BUFSIZE are the options you need
to change.

Simon