[OpenIndiana-discuss] mbuffer connection refused on varius ports ... what to try

[Harry Putnam]

Geoff Nordli <geoffn at gnaa.net> writes:

> Just a thought here, you may want to try a different ssh cipher. Give
> arcfour a try and see if that is fast enough for you.
>
> Geoff

I made an attempt to see about the various speeds available 
with different Ciphers were like

I didn't use any solaris hosts yet, as I want to ensure there
was no hidden snapshot or the like involved.

Source host       openssh 7.4p1     Windows 10 running cygwin
Destination host  openssh 7.5_p1-r1 Gentoo linux 4.9.10 kenel

The gentoo host is actually running in a vbox vm on the same
windows host ... they have bridged networks setup.

=============================================

Using default cipher (Not sure what that is or
how to find out.  But the default list below does not 
include `arcfour' so It would not be arcfour
 
 The list of defaults is:

sshd -T |grep [Cc]ipher]

 chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,
 aes128-gcm at openssh.com,aes256-gcm at openssh.com

  (on both ends)

(NOTE: I believe they are listed in order of preference so I guess
that means it would be chacha...)

time rsync -avvz ./isos g1:/

real    32m55.694s
user    5m9.918s
sys     9m41.603s

sudo du -sh /isos
29G     /isos

du -sb /isos
30833797326     /isos

28.7 GB

==============================================

At destination host remove the test data: rm -rf /isos

Now using arcfour

Specified in the cmdline on destination host,but I had to add arcfour
to the defaults on the Source host /etc/ssh/sshd_config

time rsync -avvz -e 'ssh -c arcfour' /isos / 


real    34m1.297s
user    4m22.176s
sys     7m30.078s

du -sb /isos
30833797326	/isos
28.7 GB

==============================================

As you see the default Cipher was barely a minute faster than
the arcfour over 28.7 GB of data.

Absolutely NOT a diffinative test in any way but should at least show
that on this network arcfour is likely to be no faster than the
defaults in recent openssh versions.

I still have to run an mbuffer/tamp transfer to see how that compares.