I have fedora14 installed with 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 > Now I 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 say upon ' virsh schedinfo <vm name>' Scheduler : Unknown error: Requested operation is not valid: cgroup CPU controller is not mounted Indeed I have the path : /dev/cgroup/cpu/libvirt/qemu/ but now without the <vm_name> group which is not generated despite that the VM was generated ok by virsh and I can access it Any idea what is missing or some config file needs a change ? thanks Zvi Dubitzky Email:dubi@il.ibm.com