Hello Everyone,

I wanted to ask if is there a setting, where you can isolate core0 to be exclusively used by UnRaid, without having to configure every docker and VM to use specific cores, since when core0 hits 100% the whole thing is stuck.

It would be if it would be possible to just exclude the core0.

Thanks for any advice.

14 minutes ago, TDA said:

Hello Everyone,

I wanted to ask if is there a setting, where you can isolate core0 to be exclusively used by UnRaid, without having to configure every docker and VM to use specific cores, since when core0 hits 100% the whole thing is stuck.

It would be if it would be possible to just exclude the core0.

Thanks for any advice.

Use Settings, CPU pinning.

All "not selected cores" are used by unraid exclusive (as far as i know)

You can go to Settings - CPU Pinning - Isolated CPUs

Isolate all cores except the one(s) you want Unraid to use, reboot, and the VMs/container will only use the other ones.

P.S. not sure if core 0 is already pinned to a container/VM, it will keep being used, but it won't if it's not pinned.

2 hours ago, JorgeB said:

You can go to Settings - CPU Pinning - Isolated CPUs

Isolate all cores except the one(s) you want Unraid to use, reboot, and the VMs/container will only use the other ones.

P.S. not sure if core 0 is already pinned to a container/VM, it will keep being used, but it won't if it's not pinned.

Hello,

Since I don't have pinned any Docker till now (and VM are explicitly setup to NOT use the core0+HV) I think I'll try it and get back to you in a few days :-)

Thanks for the hint!

P.S: Is this the best practices to let Unraid use his preferred CPU? (so the 0 ? )

AFAIK - if unraid need more CPUs, it will in any case use what he needs.
But not the other way around with your suggestion right?

Edited December 11, 2025Dec 11 by TDA

41 minutes ago, TDA said:

Hello,

Since I don't have pinned any Docker till now (and VM are explicitly setup to NOT use the core0+HV) I think I'll try it and get back to you in a few days :-)

Thanks for the hint!

P.S: Is this the best practices to let Unraid use his preferred CPU? (so the 0 ? )

AFAIK - if unraid need more CPUs, it will in any case use what he needs.
But not the other way around with your suggestion right?

Made the setting you suggested, and it seems that with this configuration - if you don't explicitly set the CPU PIN, only the 0-1 is used.
But according to the "help"

Meaning (from my understanding) if you isolate the CPUs apart of the one of the I want to be used by Unraid has the effect, that ALL is using only the unpinned CPUs.

Meaning, all dockers with unpinned CPUs are using the 0.

Which is exactly the opposite I wanted, so I think I have to try the other way around (selecting only the 0-12 in my case).

Edited December 11, 2025Dec 11 by TDA

Right, it may only reserve them for VMs

On 12/12/2025 at 8:48 AM, JorgeB said:

Right, it may only reserve them for VMs

It seems better in the way I configured it, but still problem when JDownloader extract rars.
The CPU spikes to 100% till isn't finished.
I also tried to allocate 4specific CPUs to the docker, but it doesn't make any difference.