I'm on an ARM board running Linux. The hardware is a vehicle domain control board which has 6 core ARM Cortex-A78AE and some machine learning cores. I don't want to reboot it because It might be a hardware or driver bug? which might be the reason that causes my performance loss issue.

```none
root@hobot:~# uname -a
Linux hobot 6.1.94-rt33 #1 SMP PREEMPT_RT Fri Nov 8 15:11:35 CST 2024 aarch64 GNU/Linux
```

I don't know what happend with my OS today, I just suddenly found out that shell commands takes too long to finish. but everything was fine a little while ago.

like:
[![enter image description here][1]][1]


As you can see, `ls` takes about over 5 seconds and it takes 100% CPU in core 4th.

I tried `strace` with `ls`. It get stuck in nothing.

[![enter image description here][2]][2]

What should I monitor to find out what happened?


 [1]: https://i.sstatic.net/26H84XtM.png
 [2]: https://i.sstatic.net/t8ddlNyf.png