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

[Alan Lamphier]

Çağlar AKYÜZ <address@hidden> writes:

> Then, I guess, you use SPI interface to transfer data from DataFlash to 
> RAM. If this is the case I don't understand how you are going to 
> transfer from Dataflash directly.

Yes, it would be SPI interface to the DataFlash.  It would not be a 'direct'
interface (sorry for the confusion) - the TCP handler would require
rewrite/additional code such that if it was passed a DataFlash address, it would
appropriately retrieve the data from DataFlash as needed.  I'm sure it could be
done, but most likely a big code change and it seems no gain for the trouble.

> Actually I think this will not improve the performance of MAC. Because 
> ACK'ing of TCP frames is one of the major drawbacks which degrades 
> performance ( thanks to Delayed ACK algorithm!). Secondly I agree with 
> you. You should use NOCOPY option. Try to segment your buffer into 2, 
> use one for Dataflash update while the other one is for MAC 
> transmission. Then, change the pointers and so on.
> >   

Thank you for your ideas,
Alan