On 03/18/2016 12:06, Rich Freeman wrote:
There is some debate about Gentoo having it enabled by default, since
it is not part of upstream. However, the hpn patch is probably fairly
popular. It is almost a fork, and I have no idea why it hasn't just
been merged into openssh proper.
Likely because several parts of it can also degrade performance, as
stated on the patch's site. It also doesn't seem to have undergone any
serious security audit, or at least that's the impression I got from a
quick review.