Thank you for the answer. It's a good diagram, but I want to know why in the system resources show separately from system resource cpu?
I don't really get, what you mean.
On your screenshot:
In CPU you have the load: 52% + 6% + 8% + 13% = 79% out of 400%
That's 19,75% of the whole CPU
In system resources you have 21% for CPU load.
19,75% and 21% (rounded) are pretty close
Why the numbers are not equal?
You told it yourself: the load is constantly changing, and may be number in system resources is derived from some previous readings, or average for 1-2-5 seconds.
Anyway, you push over 600Mbit through the CPU and it's only around 20%
So if you scale, I guess it will be first bottlenecked not by CPU, but by the 2Gbit aggregated lanes from the CPU to the ports.
And it corresponds quite well to the official test results:
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