OK, well to rephrase the requirement:

I have a 20KB/min (!) connection and the OS is currently buffering 3-4 mins worth of data, so I need to find a way to crank down the amount of buffering between the two apps, ie all I can do is affect the advertised receive window of the server socket which the remove app connects to (over localhost)

Given a set of machines running XP and Vista can anyone think of a way to control advertised receive window?

Curiously under Vista it seems that setting SO_RCVBUF controls the advertised window nicely - however, it looks like something wierd like 40KB ish + SO+RCVBUF on XP... (Need to repeat that test to remind myself of the magic number, however, I think it *wasn't* 64KB which would have been the obvious answer...)

I can post some test code if it's useful?

In reply to Re^2: Control TCP_MAXSEG (OS buffering) on Win32 by TheWildgoose
in thread Control TCP_MAXSEG (OS buffering) on Win32 by TheWildgoose

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