Re: [lwip-devel] Re: [task #7040] Work on tcp_enqueue

[address@hidden]

Alain M. wrote:
> My suggestion would be to create a compile time option:
> a) keep messages n separate pbufs
> b) allways concatenate if possible.
>
> There is a real trick behind that: if you have a 32 bit arch like ARM, 
> it can be a lot faster if there exists a function concat_data or 
> concat_pbufs that by default is memcpy, but is optimyzable. I have a 
> book that shows up to 5x speed increment for such functions (without 
> even using asm)...
>   

Sorry if I'm being dumb, but with concatenate, do you mean keep all data 
for one segment in a single pbuf? I think a compile time option for that 
is not too bad, since b) has the potential to waste memory when sending 
only small packets (unless you set the MSS real low, of course).

Simon