> 
> I had to disable the Maximum Network Buffer Size in the mean time, 
> coincidence or not the director started throwing out "unknown errors" 
> while connecting to storage, so this test is run with default buffer 
> sizes (which shouldn't be a problem -  I got 91-93% of the max link 
> speed with iperf using default buffer sizes)
> 
> This test:
>   * Uses TLS encryption [encrypted comms]
>   * Uses PKI encryption [encrypted backup data]
>   * Does not use compression
> 
> I don't think TLS/PKI is the cause - there's plenty of CPU% while it's 
> running. Could investigate this further.
> 

are you sure PKI (data encryption) is not the bottleneck? 

IMHO PKI is single-threaded (as gzip compression is) and can just use one
processor (or one core of a multi-core processor). the "plenty of CPU%"
could be the other cores which cannot be used to do encryption. on linux,
start top, press "1" and you will get stats of every core.

- Thomas 

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