CPU2+3 seems deactivate - Always 0% in System Monitor

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi

I have this strange problem with my TX2 board.

CPU 2 and 3 always shown 0% usage in both System Monitor and HTOP

With the previous version of Nvidia SDK installer the problem was not there.
Currently Jetpack 4.4 is installed

Can anybody help me with solving the problem.

3

Hi,

This is not a strange problem… because these 2 cpus are indeed get disabled after jetpack4.4.

Please refer to this post if you want to enable it.

4

Thanks.

Quick solution here:

In “/boot/extlinux/extlinux.conf”
Remove: “1-2” from the “isolcpus=” boot parameter

Resulting line looks like this:

APPEND ${cbootargs} quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 isolcpus=

5

The last occurrence of isolcpus on the kernel command line would be the one which the system uses. In the case of “isolcpus=”, and no other content, then this is likely the same as deactivating the isolcpus previous content, and should do the job.

The trick here is that you have to look at what the kernel command line actually shows after boot, and not the config file which probably works. What do you see now from:
cat /proc/cmdline

6

Removing the “1-2” worked fine -CPU’s are no longer excluded from scheduler

Your “cat /proc/cmdline” command resulted in a long string, but the essential is the end of it where isolcpus is empty

… console=tty0 fbcon=map:0 net.ifnames=0 isolcpus=