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DATE 2017-09-01

LEARN

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MESSAGE
DATE 2017-09-07
FROM Ruben Safir
SUBJECT Re: [Learn] Numa node 0 is missing from /sys/devices/system/node ,
From learn-bounces-at-nylxs.com Thu Sep 7 17:25:06 2017
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From: Ruben Safir
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Subject: Re: [Learn] Numa node 0 is missing from /sys/devices/system/node ,
only Numa node 1 is shown
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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
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies-at-kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>


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