On Mon, Jun 17, 2019 at 3:57 PM Linux-Fan <ma_sys...@web.de> wrote: > > Just a few benefits of VMs I can think of here: > ..... > * Historically, VMs were sometimes emulated and thus slower than operating > a system "bare-metal". On my systems, installations in VMs are often > faster than installations on the machine directly because they can make > use of caching (e.g. for installation media which need not be provided > as > physical media but can be image files as well), libvirt has its own DHCP > to provide IP addresses quickly etc. such that systems inside it respond > faster to certain installation tasks like getting an IP address over > DHCP. >
We should mention the various virtualization hardware assists built-into Intel and AMD CPUs which allow VMs to run with near-native performance. Not to mention the assistive code in the linux kernel itself eg. TLB, etc. These technologies were available beginning in the early 1960s (Atlas) and especially after 1965 (OS/360) and again after 1970 (MVS and VM/370) in the IBM mainframe universe. > HTH > Linux-Fan >
