Re: [lwip-users] Slow sending speed

[Kieran Mansley]

On Mon, 2008-12-22 at 23:51 +0100, Sebastian wrote:
> Hello,
> 
> as the title already says, I've got a problem with the sending speed, which 
> is 
> extremly slow. My  platform is a LPC2468 Controller from NXP with an ARM 
> Core.
> It seems the problem is that lwIP sometimes holds back packets and waits for 
> the next ACK of the packet just sent. According to a typical TCP session, the 
> remote station expects a second packet and waits for 200ms before it's sends 
> the ACK. After that, lwIP will send the next packets.

Sounds like bad interaction between the Nagle algorithm on the sender
and the delayed ACK algorithm on the receiver.

Kieran