[ECOS] ecos + lwip

[Simon Kallweit]

agfa prayoga s wrote:
> Hi all,,,
> 
> did lwIP 1.3.0 port that Simon's patched for eCos 3.0 has improvement in
> memory footprint?
> 
> i am trying to run httpd example under lwip package on AT91SAM7X-EK board
> filled with AT91SAM7X256. that microcontroller only have 256KB ROM and
> 64KB RAM.
> 
> i have compiled the example successfully only with PBUF value 10, disable DHCP,
> SLIP, PPP, raw socket support, IP forwarding.
> 
> using arm-eabi-size, httpd binary has size:
> .text : 82740
> .data: 5428
> .bss: 50792
> 
> notice that the sum of .data and .bss is almost 56KB, near 64KB.
> 
> if i increase the PBUF value over 10(default value is 60), compilation process will failed with error that
> is no longer room in .bss because the limitation in 64KB.
> 
> maybe this is out of topic, but i appreciate your assistance...

Well that's hard to say. You would need to ask that question on the lwip 
list. I don't know if there are major differences in memory consumption 
between lwip 1.1.0 and 1.3.1. One advantage of my port is that it can be 
run in a completely polled mode (I call it simple mode), so you can run 
all your network code in a single thread, instead of multiple threads 
(at least 3). The old port did not directly offer that option. This can 
spare you quite a bit of memory (stacks). Notice that when using the 
simple mode, you will have to use the raw APIs (see httpd_simple 
example) and cannot use the netconn and socket APIs. In my project, I 
use the polled mode for the exact same reason (memory) with good results.

Simon

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