Changing 1 vCPU VM Back to Uniprocessor HAL

[nsousaarlington]

Is the current recommendation to change a single-core VM back to a uniprocessor HAL for Server 2016 or Server 2019?

Also on page 27 of the vSphere 6.7 Performance Best Practices PDF, it mentions the following:

When changing an existing virtual machine running Windows from multi-core to single-core the HAL usually remains SMP. For best performance, the HAL should be manually changed back to UP.

[continuum · Accepted solution]

The info you reference was relevant in times of XP , Winows 2000 and 2003.

I doubt that any recent OS still has single CPU kernels.