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.
 

First, test with If that is still bad, see if you can set the package power limit in BIOS to 0 for both sustained and burst mode,
Then try disabling WLAN it can cause huge latency spikes on some of those NUC's

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.

Yes it is good for Mesa, so if you have the Mesa, wire it, pewer it, connect and do some tests, might need some network tweaks, but might be all good.