Help me solve big latency (INTEL NUC7 / Pentium J5005 )

Hi, I'm new here.

I downloaded recent LinuxCNC image
　　LinuxCNC 2.9.3 Debian 12 Bookworm PREEMPT-RT ISO

and I'm trying to setup to INTEL NUC7 (Pentium J5005 4core /8GB MEM + SSD).

I've read many thread on this forum and  I've configured BIOS and GRUB.

I got this big latency as a result .  (latency.png)
What am I missing ?

Please help me solve this big latency.


What I did are
1) I added GRUB.
isolcpus=1,2,3 intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll

2) I configured BIOS (screenshots)
(biosN.png)

Thank you.
 

What tommylight said indeed. HDMI CEC control off, HDD led off.
And these kernel parameters worked good for me:
isolcpus=3 intel_pstate=disable processor.max_cstate=0 idle=poll cpufreq.default_governor=performance i915.enable_dc=0 ahci.mobile_lpm_policy=1 irqaffinity=0 nomodeset quiet

Bad memory can also be a cause. You can check the following command to see if there are interrupts of other devices on the isolated cpus: cat /proc/interrupts
Did you check the temperature?

Thank you for your advice, everyone.

I got this result so far. (90 μsec jitter) really improved. 

My question is " Is 90 μsec jitter is good enough to run LinuxCNC with MESA(Ethernet FPGA Stepper) ?

 

Thank you.

I set the package power limit in BIOS to 0 for both sustained and burst mode,
But PC worked incredibly slow ..

Anyway, thank you so much. I posted new result, very improved.

Thank you so much.

I posted new result ( but I did not apply these options )
I will test later.
I should learn these options and tips.