Instead, we only found a switch for VT-d. Give a name to your virtual device and choose the type of device (phone or tablet). Now, select the operating system for which you want to create a virtual device. VT-d is a virtualization sub-technology that deals with the virtualization of IO (input-output) devices, not CPUs. Nonetheless, you should turn on whatever virtualization features your system supports. By making your CPU fully available to VirtualBox, you allow it to use multiple processors or processor cores simultaneously. Is There a Downside to Enabling Virtualization? VirtualBox now supports nested virtualization on Intel processors. In the past, this was only available on AMD processors. This opens up a whole range of applications with VirtualBox: You can run your GNS3 topologies on VirtualBox, you can nest hypervisors and have some fun. You may be wondering if virtualization is so useful, why is it turned off by default? The answer is somewhat complicated, but there are some circumstances where the feature can hurt performance. This is similar to how turning off hyperthreading could make a computer perform better with some programs. In practice, you’re unlikely to notice any performance change on a modern system. Unless you run a CPU benchmark back to back and see a different score each time, that is. Regardless, if you have to run software that doesn’t play well with hardware virtualization, it’s simple to reverse the above steps and simply turn it off again.
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