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

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Message-ID: <20140919114529.GD5366@x2.net.home>
Date:	Fri, 19 Sep 2014 13:45:29 +0200
From:	Karel Zak <kzak@...hat.com>
To:	Dave Hansen <dave@...1.net>
Cc:	linux-kernel@...r.kernel.org, dave.hansen@...ux.intel.com,
	a.p.zijlstra@...llo.nl, mingo@...nel.org, hpa@...ux.intel.com,
	brice.goglin@...il.com, bp@...en8.de
Subject: Re: [PATCH] x86: new topology for multi-NUMA-node CPUs

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@...hat.com>
 http://karelzak.blogspot.com
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