linux-kernel - Re: Purpose of numa

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Message-ID: <47A23F1C.7080809@inria.fr>
Date:	Thu, 31 Jan 2008 22:35:24 +0100
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Mundt <lethal@...ux-sh.org>,
	Chris Snook <csnook@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Purpose of numa_node?

Yinghai Lu wrote:
> On Jan 31, 2008 5:42 AM, Brice Goglin <Brice.Goglin@...ia.fr> wrote:
>   
>> It works fine on regular machines such as dual opterons. However, I
>> noticed recently that it was wrong on some quad-opteron machines (see
>> http://marc.info/?l=linux-pci&m=119072400008538&w=2) because something
>> is not initialized in the right order. But I haven't tested 2.6.24 on
>> this hardware yet, and I don't know if things have changed regarding this.
>>     
>
> that will depend if you dsdt have _PXM for your pci root bus.
> otherwise you will get all -1
>   

Have a look at the above link. I don't get -1. I get 0 everywhere, while
I should get 1 for some devices. And if I unplug/replug a device using
fakephp, numa_node becomes correct (1 instead of 0). This just looks
like the code is there but things are initialized in the wrong order.

Brice


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