Hello all, I'm trying to setup a NUMA topology identical as the machine which hosts the qemu-kvm VirtualMachine. numactl -H on the host: available: 8 nodes (0-7) node 0 cpus: 0 1 2 3 4 5 node 0 size: 8189 MB node 0 free: 7581 MB node 1 cpus: 6 7 8 9 10 11 node 1 size: 8192 MB node 1 free: 7061 MB node 2 cpus: 12 13 14 15 16 17 node 2 size: 8192 MB node 2 free: 6644 MB node 3 cpus: 18 19 20 21 22 23 node 3 size: 8192 MB node 3 free: 7747 MB node 4 cpus: 24 25 26 27 28 29 node 4 size: 8192 MB node 4 free: 7388 MB node 5 cpus: 30 31 32 33 34 35 node 5 size: 8192 MB node 5 free: 7593 MB node 6 cpus: 36 37 38 39 40 41 node 6 size: 8192 MB node 6 free: 3848 MB node 7 cpus: 42 43 44 45 46 47 node 7 size: 8192 MB node 7 free: 7502 MB node distances: node 0 1 2 3 4 5 6 7 0: 10 16 16 22 16 22 16 22 1: 16 10 22 16 22 16 22 16 2: 16 22 10 16 16 22 16 22 3: 22 16 16 10 22 16 22 16 4: 16 22 16 22 10 16 16 22 5: 22 16 22 16 16 10 22 16 6: 16 22 16 22 16 22 10 16 7: 22 16 22 16 22 16 16 10 I would like to use 2 numanodes for one VM but somehow the virsh edit DOMAIN command doesn't apply the changes I make... I tried specifying the numa topology within the <topology> sub-section of the <cpu> section as in: <cpu mode='custom' match='exact'> <model fallback='allow'>Opteron_G4</model> <vendor>AMD</vendor> <topology sockets='1' cores='6' threads='2'> <cells num='2'> <cell id='0'> <cpus num='6'> <cpu id='0'/> <cpu id='1'/> <cpu id='2'/> <cpu id='3'/> <cpu id='4'/> <cpu id='5'/> </cpus> </cell> <cell id='1'> <cpus num='6'> <cpu id='6'/> <cpu id='7'/> <cpu id='8'/> <cpu id='9'/> <cpu id='10'/> <cpu id='11'/> </cpus> </cell> </cells> </topology> <feature policy='require' name='nodeid_msr'/> <feature policy='require' name='wdt'/> <feature policy='require' name='skinit'/> <feature policy='require' name='ibs'/> <feature policy='require' name='osvw'/> <feature policy='require' name='cr8legacy'/> <feature policy='require' name='extapic'/> <feature policy='require' name='cmp_legacy'/> <feature policy='require' name='fxsr_opt'/> <feature policy='require' name='mmxext'/> <feature policy='require' name='osxsave'/> <feature policy='require' name='monitor'/> <feature policy='require' name='ht'/> <feature policy='require' name='vme'/> </cpu> I tried specifying each numa cell using a <numa></numa> section as in: <numa> <cell cpus='0-5' memory='7596032'/> <cell cpus='6-11' memory='7596032'/> </numa> In both situation virsh says it successfully applied the edit, but when I edit it again right after that the changes have been removed and the numa topology in the VM is one node with all cores. Could someone please tell me what I'm doing wrong here? Oooh, by the way, I'm using libvirt 0.10.2-0rc2 and qemu-kvm-0.12.1.2-2.295.el6_3.2 on a Scientific linux 6.2 machine. Thanks! Best regards, Geert Geurts