I’ve just updated my TX2 to Jetpack 3.0 and can only see four cores in System Monitor. Also /proc/cpuinfo also shows four cores (not six). Finally tegrastats shows two of the six cores are ‘off’. How can I enable these other two cores and should I need to be enabling cores?

Hi Ross, you can use nvpmodel to change the profile. If you want to do it manually, you can also set /sys/devices/system/cpu/cpu[0-5]/online to 1. Here’s an example: At boot, Denver2 is offline for minimal power consumption: nvidia@tegra-ubuntu:~$ ~/tegrastats RAM 970/7854MB (lfb 1546x4MB) cpu […

That was the magic I needed. Time to play.

How did you get 2419 on the two Denver cores? When I run the same commands, I only get 2035 or the same as the ARM cores.

There are five profiles. You can view these and select the mode you want using the commands below: nvpmodel -p --verbose # Lists all the modes (should be five in Jetpack 3.0) nvpmodel -m 2 # Switch to power mode 2 MAXP all cores. Hope that helps.

Thanks! So I’ve been playing with ‘nvpmodel’ and ‘jetson_clocks.sh’ this morning and have a better understanding of the different modes and configurations. To get the all-out max performance out of the TX2, it looks like sudo nvpmodel -m 0 followed by sudo ./jetson_clocks.sh gets me the following ou…

Pretty sure my board was pre-production and reported the different frequency. Also it appears that CPU0 cannot be offlined. I will compile the info in this thread into a page on the wiki.

Related question to all this - is it possible to use remoteproc to launch different OS instances on one or more of the cores? Are there examples anywhere of this with the TX1/2?

why cannot we offline CPU0 ? does CPU0 have a specific job ? Also I am wondering given above question.And Is there a way to dedicating denver cpu to specific job in order to get some sort of real time operating system characteristics.

I believe the IRQ aggregator probably goes to CPU0 (I’m not positive of the full arrangement of this, but you basically need one core assigned to handle interrupts…I wish I knew more about the aggregator topology). No aggregator feeding a core implies no hardware interrupts. You could instead power …

The way I rationalize it is that since you turn off cores through Ubuntu, there’s a mechanism in place that will not allows you to turn off ALL six cores. And core 0 is the “parent” core. Now, why you can’t turn off the ARM and only use the Denver cores I’m not sure. Again, this is an educated guess…

Hi, I tried switching the CPUs online, but I am getting following write error. root@tegra-ubuntu:/home/nvidia# cat /sys/devices/system/cpu/cpu2/online 0 root@tegra-ubuntu:/home/nvidia# echo 1 > /sys/devices/system/cpu/cpu2/online bash: echo: write error: Invalid argument any suggestions?

Two cores disabled.

Robotics & Edge Computing Jetson Systems Jetson TX2

linuxdev August 29, 2018, 7:50pm 19

Note that you may need to run nvpmodel after a reboot. File “/etc/nvpmodel.conf” stores the setting which will be used after booting.

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Two cores disabled.

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