linux-kernel - Re: Purpose of numa

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Date:	Thu, 31 Jan 2008 13:42:03 -0800
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Brice Goglin" <Brice.Goglin@...ia.fr>
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?

On Jan 31, 2008 1:35 PM, Brice Goglin <Brice.Goglin@...ia.fr> wrote:
> 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.

do you have
...
bus 00 -> pxm 0 -> node 0
...
bus 40 -> pxm 1 -> node 1
...
bus 80 -> pxm 1 -> node 1

in your boot msg or dmesg?

if not, your dsdt doesn't have _PXM for pci root bus. or you need to
ask your HW vendor to add that in their BIOS, or use my patchset.

YH
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