Re: [lwip-users] pbuf pool size / mss size in low memoryenvironmentand routing to slow link

[address@hidden]

David Empson schrieb:
> "Simon Goldschmidt" <address@hidden> wrote:
>   
> > "Marco Jakobs" address@hidden wrote:
> >     
> > > I'm just wondering how the PPP of LWIP is handling the pbuf's, maybe
> > > someone can drop a line about this ...
> > >       
> > I don't know that by heart but I think I remember the PPP code (as it is 
> > ported from sources that don't know pbufs) needs the input packets in
> > contigouous memory and copies from PBUF_POOL to PBUF_RAM if the input 
> > packet is a linked list of pbufs (i.e. p->len != p->tot_len).
> >     
>
> I can't see any evidence of that.
>   
The function pppSingleBuf() does that. However, I'm not really sure how 
often that function is used. At least with pppoe (which I'M currently 
trying to get to work :), it seems to be called on every RX pbuf, though.

Simon