Hi Richard,
KVM is just a bit better than VBox when the CPU supports hardware
acceleration (http://en.wikipedia.org/wiki/X86_virtualization),
but it's *extremely* slower when it doesn't,
and since CPUs that don't support hardware acceleration are usually
already a bit slower than the rest,
it's unsuitable for large deployments when you're sure that at least
some of the clients will not support hw assisted virtualization.
Moreover, VirtualBox is way better than KVM with regards to graphics
acceleration under Windows.
So if you're planning to select a method for schools to have Windows
over LTSP, VirtualBox (or VmWare if you don't care about having an
open source solution) are much better than KVM.
Remote desktop is very slow, it's unsuited for multimedia apps that
schools need.
And Linux+LTSP+VboxManage only need 256 MB RAM, leaving 768 MB free
out of 1 GB RAM, so the result is fine even on an 8-year old
Atom-based netbook that I tested with.
To have multiple users using a single .VDI file, you'd use snapshots
over a read-only base image, it's possible to write an LTSP screen
script for that if you don't need a Linux session.
Cheers,
Alkis
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