> I'm not using TCP_NODELAY, nor FIONBIO.  Can you elaborate does this
> matter?

TCP_NODELAY buffers the data so that from your sending code's point of view the 
data is moving quicker.

FIONBIO is to set the socket as none-blocking IO, this way if you attempt to 
use a function that would block (send() recv() etc), the function isn't 
executed full, instead it returns the errno of EWOULDBLOCK.

> (I don't find a TCP_NODELAY macro in QSYSINC.)



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