> I'm fiddling with TCP windows and I'm seeing that when
> I shrink the window to below 1448 (the payload size of an ethernet
> frame after the appropriate headers) the behavior gets weird.
Sounds reasonable.
> Using tcpdump, I observed that when the window shrunk below
> 1448, to lets say 1400 bytes, I'd get 1 packet sending 1400 bytes,
> and then the next ethernet packet sending 48 bytes. This would
> alternate until the transmission was done. As a result, I'd fall from
> an average of 970k/sec doing a web transfer to around 4k/sec.
Yes thats what I'd expect. Your window is too small
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