To enable/disable Hyperthreading in ESXi
- Configure the system BIOS to enable/disable hyperthreading
- Open Virtual Center and select Hosts and Clusters
- Select the host and click the Configuration tab
- Select Hardware | Processors - here you can view the current Hyperthreading settings
- Click Properties to change the Hyperthreading
Once enabled, Hyperthreading is defaulted to be used by all VMs in a fashion similar to multi-core processors. This sharing can be configured on a per-VM basis and be set to ANY (default), NONE (no hyperthreading), and Internal (hyperthreading only with itself). These configurations exist to stabilize individual VMs, but should be used with care.
Configuring Hyperthreading in ESXi
- Open Virtual Center and select VMs and Templates
- Select the VM and click Edit Settings
- On the Resources tab, select Advanced CPU to change the settings
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