On Wed, Aug 14, 2013 at 7:59 PM, Richard W.M. Jones <rjo...@redhat.com> wrote: > > 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.
What exactly does libguestfs do? > (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. So, libguestfs transfers all data over a serial line?! We could hack a faster transport into UML. As UML is only a process we can very easily access the host. Have looked at hostfs? -- Thanks, //richard ------------------------------------------------------------------------------ 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
