Set Hyper Threading on ESXi

[ganapa2000]

Hi,

I would like to enable and set the hyper threading on the server. basically, I want to update the parameters as below on all the hosts. how can i do it. please help.

Get-VMHost | Select Name,HyperthreadingActive,
@{N = 'UserVars.SuppressHyperthreadWarning'; E = { (Get-AdvancedSetting -Entity $_ -Name 'UserVars.SuppressHyperthreadWarning').Value } },
@{N = 'VMkernel.Boot.hyperthreading'; E = { (Get-AdvancedSetting -Entity $_ -Name 'VMkernel.Boot.hyperthreading').Value } },
@{N = 'VMkernel.Boot.HyperthreadingMitigation'; E = { (Get-AdvancedSetting -Entity $_ -Name 'VMkernel.Boot.HyperthreadingMitigation').Value } }

[LucD]

You enable HT in the BIOS.
So unless you have a PS module to interact with the BIOS, that can not be done from PS.

The other 3 settings can be done via Set-AdvancedSetting

[ganapa2000]

Yes, LucD. I have enabled the HT in the BIOS. now how do I need to set from ESXi end ?

[LucD · Accepted solution]

When it is active in the BIOS, you have to configure the advanced setting VMkernel.Boot.hyperthreading

Get-VMHost |
ForEach-Object -Process {
  Get-AdvancedSetting -Entity $_ -Name 'UserVars.SuppressHyperthreadWarning' | Set-AdvancedSetting -Value 0 -Confirm:$false
  Get-AdvancedSetting -Entity $_ -Name 'VMkernel.Boot.hyperthreading' | Set-AdvancedSetting -Value $true -Confirm:$false
  Get-AdvancedSetting -Entity $_ -Name 'VMkernel.Boot.HyperthreadingMitigation' | Set-AdvancedSetting -Value $false -Confirm:$false
}

[ganapa2000]

Thank you very much LucD, that worked 🙂