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abysmally low scp performance

I'm just scp-ing a multi-gigabyte file from one NetBSD-8 machine to another, 
and get a whopping 10MB/s throughput.
Interfaces are wm, 1000BaseT (says ifconfig and the switch), connected to 
the same (enterprise) switch.
Discs are ~20% busy on the receiving end, less on the sending end.
ssh/sshd are at ~20% CPU max, CPUs are 50% (sending side, which does multiple 
other things)/80% (receiving side, which does nothing) idle.

Any hints?

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