How to reduce system jitter?

I installed Linuxcnc-2.8 on the x86 hardware. My x86 CPU is "Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz"
When I ran the latency-test, I found that its Max Jitter reached 14us (ServoThread 1ms), 23us (Base Thread 25us).
I think this is not A good phenomenon. Some people's jitter is around 4us, but mine is very high.
By the way, I also transplanted linuxcnc on the arm64 platform, using the preempt-rt real-time patch.The test result is also not satisfactory, the maximum jitter reached 30us and 40us.
So I want to ask, how should I optimize my system to make the jitter as small as possible?
 
 

Well, I have learned that LinuxCNC's instruction manual mentions that the best jitter should be within 15us.
15-25us can also meet the requirements. If it exceeds 100us, cnc cannot be run on the current system.
So, you said that my current test results are good, do you mean my test results on x86 or on arm?
I prefer to optimize the system jitter under arm, so do you have any good suggestions?

tommylight wrote:

Those are very good results so move on !

Well, I have learned that LinuxCNC's instruction manual mentions that the best jitter should be within 15us.
15-25us can also meet the requirements. If it exceeds 100us, cnc cannot be run on the current system.
So, you said that my current test results are good, do you mean my test results on x86 or on arm?
I prefer to optimize the system jitter under arm, so do you have any good suggestions?