Hi, I have Ubuntu 14.04.5 LTS on x86_64 machine. I am using the kernel as shipped with the distro, no modification whatsoever. After fresh reboot I do see Numa node 1 but there is no Numa node 0 under: /sys/devices/system/node What can be the reason for this ? lscpu shows two sockets but only one NUMA node: lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-15 Thread(s) per core: 2 Core(s) per socket: 4 Socket(s): 2 NUMA node(s): 1 ... and cat /boot/config-4.4.0-31-generic | grep CONFIG_NUMA shows: CONFIG_NUMA_BALANCING=y CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y CONFIG_NUMA=y # CONFIG_NUMA_EMU is not set Also dmesg | grep -i numa [ 0.000000] NUMA: Initialized distance table, cnt=2 [ 0.000000] NUMA: Node 1 [mem 0x00000000-0xbfffffff] + [mem 0x100000000-0x33fffffff] -> [mem 0x00000000-0x33fffffff] Any ideas ? Regards, Kevin