I performed some benchmarks against KVM: http://rwmj.wordpress.com/2013/08/14/performance-of-user-mode-linux-as-a-libguestfs-backend/#content
Notes for those that don't want to read all that, there are at least two bugs I found: (1) fsync /dev/ubda (in the guest) is not honoured by the user-mode linux process. It should do an fsync on the corresponding backing file. (2) The ssl<N>=... serial port is really slow, at least 10 times slower than virtio-serial which is the equivalent KVM feature. libguestfs is chatty over the serial port, and so this has a significant knock-on impact all over the place. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW ------------------------------------------------------------------------------ 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
