26 Jun 2014 berend   » (Journeyer)

Suffered from very slow scp to a FreeBSD server. rootbsd said the hpn patch should help, but that it was already applied in FreeBSD 10. That was the pointer I needed.

By default FreeBSD has some kind of scp transfer performance improvement patch:



# Disable HPN tuning improvements.

#HPNDisabled no


When I change this to:


HPNDisabled yes

My scp performance jumped from about 300KB/s to 8MB/s in this particular instance. Now applying this to all my FreeBSD boxes, on my local network performance jumped from 58MB/s to 71MB/s.

I think this setting should be disabled!

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