OK, I think the FreeNAS system not correctly detecting NUMA nodes? (if I understand the man page correctly) there should be at least 2 domain?Edit your VM settings, look under CPU Options/Advanced (not sure what they're calling it these days) for the "CPU Scheduling Affinity" field.
Quick Googling turned up this document for 5.1; I believe it's pretty similar in newer versions
https://pubs.vmware.com/vsphere-51/index.jsp?topic=/com.vmware.vsphere.resmgmt.doc/GUID-F40F901D-C1A7-43E2-90AF-E6F98C960E4B.html
Code:
root@freenas:/tmp # sysctl -a | grep ndomain vm.ndomains: 1