Numa node 0 is missing from /sys/devices/system/node , only Numa node 1 is shown

[Kevin Wilson]

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