Slow nginx reverse proxy speed

[masterlowry]

Hi,

I have trouble with the speeds of my nginx reverse proxy.

I am using an HP T620+ with Intel 4 Port NIC.

When i access my services directly (via IP:Port), i get Gbit Speeds.
BUT when I use the NGINX Reverse Proxy for SSL Offloading, I am limited at about 160mbit/s.

I tried to improve some settings regarding buffering and could increase the speed from initial 120mbit to 160mbit now.

According to the Dashboard, my CPU usage is around 50-80% while Downloading a large File (at 18MB/s).

Is this a common Problem or is the T620+ just too weak for SSL Offloading?

I am using EC 256 Bit Certificates by the way.

[fabian]

The slow part of TLS is the key exchange. This is CPU intense. The other part is only possible to accelerate if your hardware has acceleration like AES-NI.

[masterlowry]

Mhm.... The CPU does support AES-NI, which is why i was wondering about this performance.
But you do not have any hint for special configuration or something right?