On 10/17/2014 09:40 AM, Sorin Srbu wrote:
>> What about testing the speed over the ssh tunnel? That may tell you
>> whether ssh is slowing down your transfers or that it's due to rsync. If it 
>> is
>> ssh, you could trade encryption strength for speed.
> Would the below do?
>
> [root@cyndane ~]# yes | pv | ssh titan "cat > /dev/null"
> 1.16GiB 0:01:29 [14.3MiB/s]
>
> [root@cyndane ~]#
>
> I searched and read som more after posting the question, and I realize it's 
> not that simple fixing this, as I initially thought...

I'd tunnel the port your use for iperf (ssh -L 5001:localhost:5001 
cyndane) and run the same test as you initially did (iperf -c 
localhost). I expect that you'll see a value that's larger than the 
35-45 Mbps you get for rsync+ssh, meaning that rsync is the bottleneck. 
And most of the time, that makes sense, because it's often doing other 
things than transferring data.

Best,
Koen


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