虚拟化开启与不开启有什么区别

Some computers need to turn on this function if they need to run virtual machine programs. For example, if you want to run Linux programs under the Windows operating system, you need to use a virtual machine. For ordinary people, it can be turned on or not. I hope it will be useful to you. You have help.

There is no harm in it. It is a virtualization technology, and it will have no impact if it is turned on.

VT refers to Virtualization Technology, virtualization technology. VT has about two functions. First, it can improve the performance of virtual machines under virtualization software (such as vmware, etc.). Second, after it is turned on, it can Create a 64-bit virtual machine on a 32-bit host. If it is not turned on, the 32-bit system can only make a 32-bit virtual machine

So, if you use virtualization software, then turn on VT. There will be more or less performance improvements (the performance improvement of the virtual machine does not improve the performance of your host computer). If you use virtualization, it makes no difference whether it is turned on or not.

Extended information

The so-called virtualization refers to dividing a single computer software environment into multiple independent partitions. Each partition can simulate a computer technology as needed. Its technical essence is to realize the management and redistribution of computing resources through the intermediate layer to maximize resource utilization.

The biggest benefit of virtualized partitioning is that the same physical platform can run multiple operating systems of the same or different types at the same time to serve as support platforms for different businesses and applications.

Partitions enable better isolation between applications. By installing different applications on different partitions, you can avoid mutual interference when running multiple applications on the same system, including competition for computing resources. The crash of a single application affects the entire system, or the maintenance and upgrade of a single application affects the operation of other applications, as well as the different requirements of each application for the version of the system platform environment component.

At the same time, it makes the backup, migration and upgrade of the system simpler and more flexible. Due to the existence of the resource management middle layer, not only the operation becomes very complicated

Reference source: Baidu Encyclopedia-VT

The only difference is that it is helpful for running virtual machines. Turning Intel VT-x on has no impact on the computer system. VT-x is Intel uses an instruction set in Virtualization technology, which is a hardware virtualization technology for the CPU.

VT can improve the efficiency of virtualization and the security of virtual machines. VT technology on the x86 platform is often called VT-x, while VT technology on the Itanium platform is called VT-i.

IntelVT can make one CPU work like multiple CPUs running in parallel, making it possible to run multiple operating systems on one computer at the same time. VT technology is not a new thing. There are some software on the market that can achieve the purpose of virtualizing multiple systems, such as virtual machines.

Virtual computers, etc., can use this technology to simulate multiple CPUs in parallel with a single CPU, and can run multiple operating systems on one machine at the same time.

Extended information:

IntelVT-d, the changes made by VT-d are also There are many, such as hardware buffering, address translation, etc. Through these various measures, VT-d realizes I/O device virtualization at the Northbridge chip level. What VT-d finally reflects on the virtualization model is the addition of two new device virtualization methods:

Direct I/O device allocation, where the virtual machine directly allocates physical I/O devices to the virtual machine. In this mode, the virtual machine's internal driver communicates directly with the hardware device directly, with only a small amount or no VMM management.

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In order to make the system robust, hardware virtualization support is required to isolate and protect hardware resources that are only used by designated virtual machines, and the hardware also needs to have multiple I/O container partitions to serve multiple virtual machines at the same time. Serve. This model almost completely eliminates the need to run drivers in the VMM.

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For example, the CPU is not an I/O device in the general sense, but it is allocated to the virtual machine in this way. Of course, the CPU resources are managed by the VMM.

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Vt-d technology enables virtual machines to use direct I/O device allocation or I/O device sharing instead of traditional device emulation/attached device interfaces, thereby greatly improving virtual I/O performance.

VT-d technology:

We know that for servers, a very important component is I/O. Although the increase in CPU computing power can process data faster, But the premise is that the data can reach the CPU smoothly. Therefore, whether it is storage, network, graphics card, memory, etc., I/O capabilities are an important part of the enterprise-level architecture.

To this end, people not only invest in transmission bandwidth (such as from Gigabit Ethernet to Gigabit Ethernet to Gigabit Ethernet), but also invest heavily in various systems and architectures ( Such as high-throughput RAID series, multi-tier data center).

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The key to I/O virtualization is to solve the problem of data exchange between I/O devices and virtual machines. This part mainly involves DMA direct memory access and IRQ interrupt requests.

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And processor IntelVT-I like VT-x. IntelVT-d technology is a hardware-assisted virtualization technology based on the Northbridge Northbridge chip. It provides the built-in virtualization and IRQ virtualization hardware of the DMA Northbridge chip to achieve With a new I/O virtualization method, IntelVT-d can greatly improve the reliability, flexibility and performance of the I/O virtual environment.

vt refers to VirtualizationTechnology, virtualization technology. CPU virtualization refers to a technology that divides a single computer software environment into multiple independent partitions, and each partition can simulate a computer as needed. So what is the use of turning on vt?
1. It can improve the performance of virtual machines under virtualization software (such as vmware, etc.).
2. After turning it on, you can create a 64-bit virtual machine on a 32-bit host. If it is not turned on, a 32-bit system can only create a 32-bit virtual machine.
3. Therefore, after understanding VT, you will know that if you use virtualization software, then turning on VT will more or less improve the performance (the improvement of virtual machine performance is not Improve the performance of your host machine).
4. If there are no software or games in your computer that require VT virtualization, it does not matter whether you can enable it or not, and enabling VT virtualization technology will not have any impact on the computer, so You can open it with confidence. Generally, the BIOS will enable it by default if the CPU supports it.
This concludes the introduction to the usefulness of turning on vt.