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^ See [20] for a paper comparing performance of paravirtualization approaches (e.g. Xen) with OS-level virtualization ^ Requires patches/recompiling. ^ Exceptional for lightweight, paravirtualized , single-user VM/CMS interactive shell: largest customers run several thousand users on even single prior models.
Kernel-based Virtual Machine (KVM) is a free and open-source virtualization module in the Linux kernel that allows the kernel to function as a hypervisor. It was merged into the mainline Linux kernel in version 2.6.20, which was released on February 5, 2007. [ 1 ]
VirtualBox also contains a dynamic recompiler, based on QEMU to recompile any real mode or protected mode code entirely (e.g. BIOS code, a DOS guest, or any operating system startup). [42] Using these techniques, VirtualBox could achieve performance comparable to that of VMware in its later versions. [43] [44]
In computer networking, TUN and TAP are kernel virtual network devices. Being network devices supported entirely in software, they differ from ordinary network devices which are backed by physical network adapters.
Paravirtualization improves performance and efficiency, compared to full virtualization, by having the guest operating system communicate with the hypervisor. By allowing the guest operating system to indicate its intent to the hypervisor, each can cooperate to obtain better performance when running in a virtual machine.
As with KQEMU, VirtualBox runs nearly all guest code natively on the host via the VMM (Virtual Machine Manager) and uses the re-compiler only as a fallback mechanism – for example, when guest code executes in real mode. [21] In addition, VirtualBox did a lot of code analysis and patching using a built-in disassembler to minimize recompilation.
The introduction of protected mode to the x86 architecture with the Intel 80286 processor brought the concepts of physical memory and virtual memory to mainstream architectures. When processes use virtual addresses and an instruction requests access to memory, the processor translates the virtual address to a physical address using a page table ...
Proxmox VE is an open-source server virtualization platform to manage two virtualization technologies: Kernel-based Virtual Machine (KVM) for virtual machines and LXC for containers - with a single web-based interface. [11]