Strange issue with scp performance

[Julian Elischer]

On 3/10/2016 12:22 AM, 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
of course we just removed the HPN option for FreebSD's ssh/scp
what version are you using?

>
> in sshd_config was enough to bring it on par with linux.
>
>>
>
>