linux-kernel - Re: SNB PCI root information

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Date:	Mon, 25 Jun 2012 11:07:32 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Brice Goglin <brice.goglin@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ulrich Drepper <drepper@...il.com>, jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lenb@...nel.org, x86@...nel.org, linux-pci@...r.kernel.org
Subject: Re: SNB PCI root information

Le 22/06/2012 22:41, Yinghai Lu a écrit :
> On Fri, Jun 22, 2012 at 1:38 PM, Brice Goglin <brice.goglin@...il.com> wrote:
>> Le 22/06/2012 19:28, Yinghai Lu a écrit :
>>> On Fri, Jun 22, 2012 at 12:14 AM, Brice Goglin <brice.goglin@...il.com> wrote:
>>>
>>>>> BIOS _PXM return 0 for both pci root buses?
>>>>>
>>>> Here's dmesg.
>>>> I can't say for sure whether _PXM returns 0 since I don't know how to
>>>> read all this :) But Linux puts the first socket cpumap in
>>>> /sys/bus/pci/devices/*/local_cpus (and that's wrong according to the
>>>> motherboard manual and according to the performance we see).
>>>>
>>> hi, looks like you system bios does not provide _PXM for the root bus.
>>>
>> So why does Linux say that all buses are close to socket 0 instead of
>> close to everything as usual?
>         if (bus && node != -1) {
> #ifdef CONFIG_ACPI_NUMA
>                 if (pxm >= 0)
>                         dev_printk(KERN_DEBUG, &bus->dev,
>                                    "on NUMA node %d (pxm %d)\n", node, pxm);
> #else
>                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
> #endif
>         }
>
> so can you boot with "debug ignore_loglevel" ?
>

I can't find anything relevant in the debug log. The code has changed a
lot since my old SLES11 but I don't see any old message either. I guess
"bus && node != -1 && pxm>=0" evaluates to false.

Brice

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