Re: [lwip-users] buffering outgoing packets

[Simon Goldschmidt]

Tyrel Newton wrote:
> I'm wondering if there is any truth to this statement. Do outgoing 
> packets that are queued at the network interface driver level
> really need to be copied verbatim into a separate buffer? This seems 
> counter-intuitive to lwIP's low-memory usage design goals.

That's a topic we've already discussing about and which we wanted to fix with 
1.4.0 (as it might involve API- or doc-changes). You can always try to not copy 
the packets (which is of course desirable), but you *might* run into changes if 
you are using the RAW API and are re-using pbufs passed to one of the 
output/send/write functions *or* if you are using IP-fragmentation (IP_FRAG==1).

See http://savannah.nongnu.org/task/?7896 and 
https://savannah.nongnu.org/bugs/?29361 for bugtracker entries about this issue.

Simon
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