2 CPU’s usage 0% - Jetpack 4.4, L4T R32.4.2

2 cpus are not working even though I enabled all the cores with the below command.

sudo nvpmodel -m 0
sudo tegra_clock 

I can see 6 cpus on the htop but it seems 2 cpus are not assigned.
There are 10 threads at least.

Does anyone have an idea?

htop

  1  [|||||||||||||||||||||||||||||||||||||||||||||||100.0%]   4  [|||||||||||||||||||||||||||||||||||||||||||||||100.0%]
  2  [                                                 0.0%]   5  [|||||||||||||||||||||||||||||||||||||||||||||||100.0%]
  3  [                                                 0.0%]   6  [|||||||||||||||||||||||||||||||||||||||||||||||100.0%]
  Mem[||||||||||||||||||||||||||||||||||||||||||5.72G/7.67G]   Tasks: 85, 151 thr; 6 running
  Swp[|                                         1.50M/3.84G]   Load average: 3.25 1.48 0.91 
                                                               Uptime: 01:07:35

jetson_clocks

nvidia@milab:~$ sudo /usr/bin/jetson_clocks --show 
SOC family:tegra186  Machine:quill
Online CPUs: 0-5
CPU Cluster Switching: Disabled
cpu0: Online=1 Governor=schedutil MinFreq=2035200 MaxFreq=2035200 CurrentFreq=2035200 IdleStates: C1=0 c7=0 
cpu1: Online=1 Governor=schedutil MinFreq=2035200 MaxFreq=2035200 CurrentFreq=2035200 IdleStates: C1=0 c6=0 c7=0 
cpu2: Online=1 Governor=schedutil MinFreq=2035200 MaxFreq=2035200 CurrentFreq=2035200 IdleStates: C1=0 c6=0 c7=0 
cpu3: Online=1 Governor=schedutil MinFreq=2035200 MaxFreq=2035200 CurrentFreq=2035200 IdleStates: C1=0 c7=0 
cpu4: Online=1 Governor=schedutil MinFreq=2035200 MaxFreq=2035200 CurrentFreq=2035200 IdleStates: C1=0 c7=0 
cpu5: Online=1 Governor=schedutil MinFreq=2035200 MaxFreq=2035200 CurrentFreq=2035200 IdleStates: C1=0 c7=0

hello daniel07flx,

those two CPU were Denver cores.
please access r32.4.2 release notes, you should check [Chapter-5.16 Increased Kernel Launch Latency on Denver 2 Cores] for the details.

you might remove “isolcpus=1-2” to enable that,
please also check similar discussion thread, Topic 124708 for reference.
thanks

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