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Date: Fri, 22 Mar 2013 21:26:44 +0530
From: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [BUG][PATCH] powerpc: fix numa distance for form0 device tree
Message-ID: <20130322155644.GB26283@dirshya.in.ibm.com>
References: <20130322154935.GA26283@dirshya.in.ibm.com>
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Cc: Linux PPC dev <linuxppc-dev@ozlabs.org>,
 Michael Neuling <mikey@neuling.org>
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* Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> [2013-03-22 21:19:35]:

[snip]

>     Prior to the above commit:
>     #define node_distance(from,to)
>     	((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
>     
>     Restoring compatible behavior with this patch for old powerpc systems
>     with device tree where numa distance are encoded as form0.

This patch on v3.9-rc3 has been tested on multi-node POWER7 with
different device tree combinations.

numactl -H would show local distance '10' for same node and remote
distance '20' for other nodes.  This ensures NUMA level sched domain
gets built and load balancing could work across such configurations.

--Vaidy