Date: Sat, 27 Aug 2022 14:17:21 -0500
From: Clay Daniels <clays.shell%sdf.org@localhost>
To: Michael van Elst <mlelstv%serpens.de@localhost>, current-users%netbsd.org@localhost
Subject: Re: ssh, HPN extension and TCP auto-tuning
On 8/27/22 05:37, Michael van Elst wrote:
In https://mail-index.netbsd.org/current-users/2017/09/20/msg032361.html
there was a discussion about effectiveness of the "High Performance
Networking" patch to OpenSSH that we keep in our tree.
Details about the HPN patch can be found at:
https://www.psc.edu/hpn-ssh-home/hpn-ssh-faq/
This led finally to the decision to disable the HPN mode by default
by setting the Option HPNDisabled to yes in /etc/ssh/sshd_config
for netbsd-10.
I have now committed part of the latest version of the HPN changes
that handle TCP window auto-scaling, which avoids the issue we saw
in the past, at least in the network environments I can test.
I'd like to see tests from other people that may help with the decision
to re-enable it, or to abandon the HPN changes.
I regularly use ssh to connect from my netbsd installed on an older machine
here at home to the SDF.org servers on a NetBSD 8.2 machine. Right now I have
yesterdays current head Fri Aug 26 11:03 installed at home. I would love to
help test what I can. Do I need to get a more recent snapshot? I see one on
the server that is 27 Aug 07:34. Would that one work?
Clay