On Sun, Aug 11, 2013 at 09:05:08PM +0200, Geert Uytterhoeven wrote: > On Fri, Aug 9, 2013 at 10:43 PM, Richard W.M. Jones <rjo...@redhat.com> wrote: > > * UML is pretty fast! It's certainly faster (by a factor of > 5) than > > spinning up a lightweight KVM VM.
> This is interesting. Typically people say you have to use KVM or XEN > for good virtualization performance. But for that you need > sufficient privileges. I think this is true of Xen, but to be fair to KVM it doesn't require special privileges, with one exception. If you want KVM to use a tunX network interface then you have to start it as root (or use a setuid helper). I think this is probably true of UML too although I've not explored UML's networking yet. Basically it's a restriction in Linux itself. > With UML, all you need is to be able to compile and run your own > executables. With libguestfs we specifically don't want people to use root, so UML not requiring root was one reason why it's possible to write a UML-based libguestfs backend. I now have a UML backend for libguestfs working, with a significant part of the testsuite passing too. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#) ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
