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

[Ruben Safir]

On 09/07/2017 03:32 PM, Kevin Wilson wrote:
> 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
> 
https://www.kernel.org/doc/ols/2004/ols2004v1-pages-89-102.pdf


> 
> 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
> 
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> 


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