Virtualisation
vm hypervisors, my conclusions at the moment
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Best for Windows host OS is Hyper-V. Best for Linux host OS is KVM.
KVM vs Hyper-V performance
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When comparing the performance of KVM (Kernel-based Virtual Machine) and Hyper-V, both hypervisors have their strengths and are suitable for different environments.
How does KVM compare to Hyper-V?
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KVM (Kernel-based Virtual Machine) and Hyper-V are both powerful hypervisors used for virtualization, but they have some key differences:
Filesystem driver that enables caching of virtual HDDs for Hyper-V/VMWare/VirtualBox by the host OS
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Here is a filesystem driver that intercepts opening of VHD files by Hyper-V/VMWare/Virtualbox and removes the flags that prevent their caching.
Hyper-V VM and HDD usage report in Task Manager
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If you look at the HDD busy state report in the Task Manager of a Windows 10 or 11 VM under Hyper-V, you will see the general busy state of the physical HDD of the host where the VHD/VHDX is locate