Linked by Drumhellar on Thu 28th Jun 2012 11:18 UTC
Windows Since its introduction at Microsoft's BUILD conference last September, Windows 8 has garnered a large measure of attention, especially with regards to the new Metro interface. The feature that intrigued me the most, however, was the inclusion of Hyper-V.
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RE[2]: Performance on host system?
by tanzam75 on Thu 28th Jun 2012 22:25 UTC in reply to "RE: Performance on host system?"
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At least for Windows 8, Hyper-V is a service like any other (mostly), and doesn't virtualize the host like 2008/R2.

I've been playing Deus Ex lately, and haven't noticed a performance or quality difference with Hyper-V installed or not.

You would not be able to feel the performance penalty in client usage. You would need to benchmark your machine before and after adding the Hyper-V role to get an accurate measurement.

Hyper-V is a hypervisor, or Type 1 virtual machine monitor. By definition, it runs directly on bare metal. This means that all OSes -- including the primary OS -- run on top of Hyper-V, rather than directly on the CPU.

The way it worked on Windows Server was that the primary Windows instance got direct access to the hardware, while the other virtual machines didn't. Thus, the primary Windows instance had access to sound and USB, even though it was running on top of Hyper-V, which did not provide emulated or enlightened devices for these functions.

Windows Server began running on top of Hyper-V as soon as the Hyper-V role was installed -- even if you created no other virtual machines. (This is why installing/removing Hyper-V required a reboot.)

Microsoft has stated that a CPU with SLAT will be required to run Hyper-V on Windows 8. This is presumably because high-performance video drivers will thrash the TLB if the CPU does not have SLAT. This may be acceptable on a server, but would be unacceptable on a workstation.

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