Re: [lwip-users] Desired - reference netconn_write() to external memory

[Çağlar AKYÜZ]

Alan Lamphier yazmış:
> I've 'inherited' an application where I need to pull GB's of data out of a tool
> running on a AT91SAM7X256.  
> Currently I simply play with...
> - the data is read from external memory and buffered in RAM
> - netconn_write() is called with COPY enabled
> - the loop repeats
> I don't have the processor memory to optimally up the pbuf and memory lwIP
> options for a large data transfer application.
>
> What came to mind today was the possibility to call netconn_write() with
> NO_COPY, referencing an external memory location instead of pointing to an
> internal buffer.
>   
What kind of external memory do you mean? SAM7X does not have any 
external memory bus. Are you using a parallel memory from GPIO?
> Any thoughts? - not worth it?
> Gut feeling - would it be a large code rewrite/addition?
> Have you lived with or solved similar problems doing large data transfers?
>
>   
Actually I'm unable to get your problem. If you are facing slow transfer 
rate and want to increase it, then try to give some extra information. 
For instance, I couldn't exceed 5 KBytes per second transfer rate with 
TCP on a SAM7X while I can reach 800 KBytes per second with UDP one the 
same machine.
> Thanks,
> Alan
>
>
>
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