@Andrew Per your example, if the NUMA size is 16 cores with 32 threads, would a 32 vCPU VM fit inside the NUMA node or would that spread them out across both nodes?

@planedrop This is for wide VMs spanning across socket NUMA nodes. These are all dual-socket servers.

I was hoping if there are any best practices for topology or anything like that. I don't have any desire/intention to pin the vCPUs onto a specific NUMA node. Coming from vSphere, I was instructed, if at all possible, not to have more vCPUs on a VM than there are pCPUs on a NUMA node. That way you can let the scheduler handle it optimally.

Good Morning Everyone,

We are currently in the midst of testing XCP-ng as a replacement for our vSphere infrastructure. I have a general idea of the how wide VMs work in VMware, and what settings should be in place, for wide VMs that are larger than a NUMA node on our servers.

Are there any recommendations for VMs on XCP-ng that are span across NUMA nodes? Any advice or information would be greatly appreciated.

Thanks!