Hi , I need to reserve some specific cpu core’s for my application , I wanted to ask how can I do this on my target (Nvidia Jetson Xavier AGX) , how can i set isolcpus here , Is it possible to do without flash, or any other way. Please provide some inputs . Thanks & Regards, Harshad

Hi, Please check if this post helps: How to redefine TX2NX dtb - #2 by linuxdev Probably this makes the setting in extlinux.conf be ignored: Do note that if the .dtb file is not found from the FDT entry, then it will revert to using the one in a partition instead.

taskset -cp PID will show affinity for process PID. For assigning a core, just use -c: taskset -c 1,2 <your_app> Then get its PID : ps aux | grep <your_app> and check with: taskset -cp <your_app_PID>

Hi, I tried to change extlinux.config like below to reserve cpu core 1 & 2 : TIMEOUT 30 DEFAULT primary MENU TITLE L4T boot options LABEL primary MENU LABEL primary kernel LINUX /boot/Image INITRD /boot/initrd APPEND ${cbootargs} quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 consol…

Hi, Do you mean the following steps does not work? Modify /boot/extlinux/extlinux.conf to add isolcpus=1-2 Reboot the system Run high CPU load application and check loading of CPU core #1 and #2 in tegrastats

Hi, Yes. I did both step 1 & 2 but it did not worked for me. After reboot I can see load on all the cores which means the cores I reserved using isolcpus are not isolated. I also checked cat /proc/cmdline it is also not showing isolcpus there. Can you please tell me why it is not working??

Hi, Do you use Jetpack 4 or 5? And please check if there is another exelinux.conf in rootfs. A user has hit an issue like: Jetson not using FDT setting in extlinux.conf

Hi, The target which we are using is Nvidia Jetson AGX Xavier and the jetpack version installed in jetpack 4.6. Yes , I also doubt that there is some other extlinux.conf or may be other boot folder present on the target somewhere but I am unable to find where it is. Is there any way to find this?? …

If no valid kernel image or device tree are found, there are backup versions that are flashed as separate partitions. You may see these with gdisk. Though, you’d better try to get a working config with extlinux.conf

Hi , Can you please let me know how can i check seperate partitions where extlinux.conf is present using gdisk? Also one more thing i observed is that even if i remove boot folder or rename it then also my target is able to reboot which means there is some other boot folder present in target but i…

Hi, Please try to modify the file in rootfs: Linux_for_Tegra/rootfs/boot/extlinux/extlinux.conf And re-flash Xavier developer kit. This should make permanent setting. Please give it a try.

Hi, Is there any way todo this without reflash, as I don’t want this setting as permanent , just want it for sometime then remove it. So i don’t want to go for flashing with host pc. Please let me know if there is way to find out extlinux.conf in other location?

How to reserve cpu core's on nvidia jetson xavier agx?

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier

hc_0302 December 28, 2022, 11:18am 22

Hi,

Yes we can re-flash. But we have flashed our custom Image recently into the target and before that also the system behaviour was same.

So can you tell me what would change if we reflash??

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How to reserve cpu core's on nvidia jetson xavier agx?

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