Sorry . I have'nt got an answer from the user's list . I have fedora14 installed with its standard libvirt-0.8.3. I can start VM using .xml files and also run: virsh schedinfo. the cgroup CPU controller is mounted and active . In fact I have the path to the Virtual machine : /dev/cgroup/cpu/libvirt/qemu/<vm name > I now upgraded to libvirt-0.8.8 from a tar ball ( configure , make , make install) . I rebooted , new libvirtd started . virsh is working ok (I can create a vm) except for the commands : schedinfo and memtune that e.g. say upon ' virsh schedinfo <vm name>' Scheduler : Unknown error: Requested operation is not valid: cgroup CPU controller is not mounted But the CPU controller is mounted because I have the path : /dev/cgroup/cpu/libvirt/qemu/ . What I am missing is the <vm_name> group which is not generated despite that the VM was generated ok by virsh create and I can access it. Any idea what is missing ? Zvi Dubitzky Email:dubi@xxxxxxxxxx -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list