Re: [PATCH] x86: new topology for multi-NUMA-node CPUs

[Karel Zak <kzak@redhat.com>]

On Thu, Sep 18, 2014 at 12:33:34PM -0700, Dave Hansen wrote:
> The sysfs effects here cause an issue with the hwloc tool where
> it gets confused and thinks there are more sockets than are
> physically present.
> 
> Before this patch, there are two packages:
> 
> # cd /sys/devices/system/cpu/
> # cat cpu*/topology/physical_package_id | sort | uniq -c
>      18 0
>      18 1
> 
> But 4 _sets_ of core siblings:
> 
> # cat cpu*/topology/core_siblings_list | sort | uniq -c
>       9 0-8
>       9 18-26
>       9 27-35
>       9 9-17
> 
> After this set, there are only 2 sets of core siblings, which
> is what we expect for a 2-socket system.
> 
> # cat cpu*/topology/physical_package_id | sort | uniq -c
>      18 0
>      18 1
> # cat cpu*/topology/core_siblings_list | sort | uniq -c
>      18 0-17
>      18 18-35

 hmm... it would be also nice to test it with lscpu(1) from 
 util-linux (but it uses maps rather than lists from cpu*/topology/).

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com