Re: [lwip-users] How to optimise

[Paul C]

Hi Chris and list.

I too have a Renesas H8 based system. How are you measuring the 
performance? What physical interface are you using? 

We are using the H8S2633 which has 16k of internal ram and slower
larger external ram and rom. Presently the internal ram 
is used for stack only. I would like to know is it preferable
to put core lwip functions into this ram (2x speed up from 
external rom) or should I put lwip data structures in there
(2x apeed up from external ram). I havent done any profiling.
Does anyone on the list have any suggestions for the areas
data/program that would benefit most from being put in 
fast ram?

thanks

Paul



On Fri, 20 Aug 2004 15:12:58 +0100, "Chris WIlliams"
<address@hidden> said:
> I now have a full implementation running on an Hitachi H8 processor. I
> am doing Telnet and FTP servers OK. 
> 
> This is meant to be a high performance system, so my question is:
> 
> How do I optimise the lwip parameters to get the best performance? I am
> not memory limited, so what values should I have for 
> 
> PBUF_POOL_BUFSIZE Should this be as big as the biggest packet?
> TCP_MSS currently 1024, but should this be more like 1550?
> TCP_WND currently 2100, but on a system with a fairly large round trip
> delay should this be much bigger, say 5000?
> 
> I would appreciate any help with this. Has anyone written a document on
> the various optimisations?
> 
> Thanks, Chris.
> -- 
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