[lwip-users] Re: [lwip] Has anyone looked at porting lwIP to Redhat's ECOS?

[Adam Dunkels]

On Tuesday 09 October 2001 15:18, you wrote:
> I've had a quick look across your sources. I'd like to say thanks a lot for
> your work! And congratulations for the way you have approached things. For
> me, your code is easier to understand than the eCos stuff, more compact,
> and quite clean and portable.

Thanks! 

> If our problems with the eCos network stack retain, I'd be very interested
> to give lwIP a try under eCos.
>
> >512k is quite a lot for running lwIP with a small web server. The one
>
> running
>
> >at http://lwip-demo.sics.se/ has 100k flask and 10k RAM and works like a
> >charm!
>
> Great! Under eCos, we use about 256 kB RAM only for network buffers and
> still our webserver hangs under heavy traffic.

I can't really say that the lwip-demo server has been exposed to heavy 
traffic - 10 hits per hour the last 8 hours. Also, the dynamic pages are very 
simple (the statistics and the stack usage), and it is those that actually 
use resources.

> >I'll se if I can get hold of the book, and perhaps a simple PPP might be
> >found in future versions of lwIP.
>
> That would be a great thing!!!

And this seems more and more likely!

> While I have found a variety of smallish TCP/IP implementations with SLIP
> support, PPP can hardly be found. I would not be keen enough to port pppd
> from Linux/BSD. OK I find SLIP good enough, but the tragedy is that there
> are almost no ISP's with SLIP accounts left.

Yes, I have seen this as well. The reason for this is simple - SLIP is 
several orders of magnitude simpler to implement than PPP. A SLIP 
implementation is even provided in the SLIP RFC (some 20 lines of code!), 
whereas PPP is quite a large beast.

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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