[tptacek]

If it's the buffering delay I'm thinking of, and your packet capture filter is tight, the delay we're talking about can be multiple seconds long. Changing window sizes won't fix it.

[tjz77]

I haven't read your code yet but I was curious about which packet you are ACK'ing?

Is your ACK sequence number the sum of all received data lengths? I think that is how that works?