CONFIG_RCU_FAST_NO_HZ=y works badly in 3.3.x/3.4.x, and it's not suitable for servers at all, so please turn it off.
kernel-image-std-pae-1:3.3.8-alt1 -> sisyphus: * Tue Jun 05 2012 Anton Protopopov <aspsk@altlinux> 1:3.3.8-alt1 - Update to 3.3.8 - Disable RCU_FAST_NO_HZ (ALT 27405)