Hypethreading (SMT) and CPU settings

SionFE

New Member
Jul 9, 2021
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Hello,
I have Proxmox VE 7.0 running on PC with AMD Threadripper 2920X (12C/24T). SMT (or Hyperthreading) is enabled. CPU has two NUMA nodes. I have two VMs:
1. WIndows 10 VM for gaming and work.
2. Linux VM that is hosting game, web and mail servers.
Both VMs have high CPU utilization. Windows 10 VM is bound to first NUMA node and Linux VM is bound to second. I want Windows 10 VM to use 4 physical cores of Threadripper (or 8 logical threads) and Linux VM to use 6 physical cores (or 12 logical threads). 2 cores are reserved for other purposes. So what the CPU configuration of these two VMs should be? 1 socket, 4 cores and 4 vcpus for Windows 10 and 1 socket 6 cores 6 vcpus for Linux? Or 1 socket, 8 cores, 8 vcpus for Windows 10 and 1 socket 12 cores and 12 vcpus for Linux? I want to avoid overcommiting and sharing resources between these two VMs. And what should I do with CPU limit option?
 

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