CPU usage is only ~50% on encrypted share access

[Doman]

Hello.

 

I have 2 test platforms running XPEnology - based on AMD E-350 and Intel E... some dual core. I use the same HDD.

 

With AMD I get transfers aprox 25MB/s in write and 35MB/s in read with encrypted shares. For Intel it is about 50MB/s in write, don't remember the read transfers.

 

With non encryted shares I reach aprox 100MB/s transfers, much much higher. So the bottleneck for encrypted shares transfers is the CPU. Then why accessing encrypted share takes "only" about 50% of CPU usage? I have a feeling that a lot of CPU resources is simply wasted.