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Re: debugging low transfer speed

To debug things like this, I know of only one truly effective way, and
it's a little involved.

1) While doing transfers, capture tcpdumps of them (all TCP packets) at
each end.  Having both lets one separate an endpoint not sending a
packet from the packet not arriving at the other.

2) Install xplot (in pkgsrc), and use tcpdump2xplot.  Read the
explanation in the xplot sources.  Read all the TCP congestion-control
RFCs.  Analyze the plots to see what's wrong.

But seriously, step 2 isn't that hard, if your problem is not that

I am happy to look at the plots, if you want to provide either the raw
tcpdump files or the tcpdump2xplot output.

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