KSM sharing not working

Hello,

I download .iso and install (today), but KSM sharing not working
CPU: 2x L5520

root@t90:~# pveversion -v
proxmox-ve-2.6.32: 3.1-114 (running kernel: 2.6.32-26-pve)
pve-manager: 3.1-21 (running version: 3.1-21/93bf03d4)
pve-kernel-2.6.32-26-pve: 2.6.32-114
lvm2: 2.02.98-pve4
clvm: 2.02.98-pve4
corosync-pve: 1.4.5-1
openais-pve: 1.1.4-3
libqb0: 0.11.1-2
redhat-cluster-pve: 3.2.0-2
resource-agents-pve: 3.9.2-4
fence-agents-pve: 4.0.0-2
pve-cluster: 3.0-8
qemu-server: 3.1-8
pve-firmware: 1.0-23
libpve-common-perl: 3.0-8
libpve-access-control: 3.0-7
libpve-storage-perl: 3.0-17
pve-libspice-server1: 0.12.4-2
vncterm: 1.1-4
vzctl: 4.0-1pve4
vzprocps: 2.0.11-2
vzquota: 3.1-2
pve-qemu-kvm: 1.4-17
ksm-control-daemon: 1.1-1
glusterfs-client: 3.4.1-1

i try restart service
root@t90:~# /etc/init.d/ksmtuned restart
Stopping KSM control daemon: ksmtuned.
Starting KSM control daemon: ksmtuned.
root@t90:~# cat /sys/kernel/mm/ksm/pages_sharing
0

root@t90:~# free -m
total used free shared buffers cached
Mem: 36193 20743 15450 0 1060 362
-/+ buffers/cache: 19319 16874
Swap: 35839 0 35839
root@t90:~#



Please help :)