July 7, 20232 yr Hello all. Recently upgraded to 6.12.2 on a 12th gen Dell R720. Everything was running fine after the upgrade. I decided to try out the CPU isolation feature. I have a total of 40 CPUS (20 main cores and 20 hyper threads). I left 4 CPUs unchecked, and selected the remaining 36 CPUs for isolation. My understanding is that the 36 selected CPUs are then only allocated to Docker containers or VMs. Based on the help text that shows up under the CPU Isolation area Quote CPU isolation allows the user to specify CPU cores that are to be explicitly reserved for assignment (to VMs or Docker containers). So that leaves 4 CPU for unraid and the rest for docker and vms. I then try to startup my plex docker container, for which I have allocated 8 CPUs that are within the 36 available to the containers via the isolation. I then get this error starting the plex container., Quote docker: Error response from daemon: Range of CPUs is from 0.01 to 4.00, as there are only 4 CPUs available. See 'docker run --help'. It appears docker is only seeing the 4 CPUs that are not isolated rather than seeing the 36 CPUs available that it can use for the container. Is my understanding of the CPU pinning correct here, and if so, is this a potential bug?
July 7, 20232 yr Solution Not a bug but rather misleading documentation. Isolation is for VMs. Pinning if for dockers.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.