Re: [lwip-users] speed and delay question with uc/os-ii

[K.J. Mansley]

On Wed, 2004-08-25 at 09:13, address@hidden wrote:
> Hi!
> 
> I'm using lwip with uc/os-ii. I'd like to know which is the wastest & 
> delayless
> way to send data (size of data to send is about 4260 Bytes).
> 
> I'm using TCP with netconn_write() at the moment but have a little problems 
> with
> delay (20 ms) & retransmissions...
> 
> So, is UPD faster way or should i use tcp_write() or something like that??? I
> think that with UDP i could get rid of these retransmissions.

The raw API (e.g. tcp_write() etc) will be faster than using netconn_*

UDP may make a small difference, as it's a simpler protocol, but if
you're losing data you'll need to do retransmissions whatever transport
protocol you choose.  I would try to work out why data need to be
retransmitted, and address that.  If you are just doing a single short
transfer over each connection you may find UDP helps by not having the
"slow start" phase of TCP.

Hope that helps,

Kieran