Hello Julian,
(pls include me in your To/Cc pls)
> of course we just removed the HPN option for FreebSD's ssh/scpwhat version
are you using?
I am using OpenSSH_6.6.1p1, OpenSSL 1.0.1p-freebsd 9 Jul 2015 on
10.2-RELEASE-p7 . I read the news about dropping the HPN patch.
Recently we had experienced low scp performance between a new (modern) linux host we cloned to some cloud provider and a local quite old linux machine. I noticed that I had the same low performance
between the new remote linux and my FreeBSD box, so I tried to address this.
However no matter the HPN tuning, on this particular connection (about 100ms latency), the bhyve Ubuntu is *always* faster than its host (my FreeBSD box), so I guess the benefit from HPN would be
marginal anyway.
On 03/10/2016 10:22, Achilleas Mantzios wrote:
On 01/10/2016 03:55, John-Mark Gurney wrote:
Achilleas Mantzios wrote this message on Wed, Sep 28, 2016 at 13:26 +0300:
We have a weird situation here. We just made a clone of a virtual image running
Linux and sent it over to some could provider. The problem is that the scp
performance to *many* hosts in our office
center has worsened considerably, including one freebsd box.
In this freebsd box I run also a jail, and a linux ubuntu image with bhyve. The
crazy thing here is that :
1) scp from the original (local office center) linux image to the host FreeBSD,
its jailed FreeBSD and its bhyve linux is 2.7 MB/s
2) scp from the cloud linux image to the host FreeBSD is slow (~300KB/s)
3) scp from the cloud linux image to the above FreeBSD's jail is slow(~300KB/s)
4) scp from the cloud linux image to the above FreeBSD's bhyve ubuntu is
fast(~1->1.5MB/s)
What can cause this behavior?
PS
Please answer to me directly as I am not subscribed to -net.
Thanks a lot for any ideas.
I worked on this last year a bit, but was never able to track it down.
It may be an issue w/ internal SSH's buffering not growing properly to
handle the latency.
I posted some info on the wiki about this:
https://wiki.freebsd.org/SSHPerf
Thanks tons!
In this case of mine, just playing around with HPN:
HPNDisabled no
HPNBufferSize 8192
in sshd_config was enough to bring it on par with linux.
--
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt
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