linux-kernel - Re: SNB PCI root information

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Message-ID: <4FE41B3E.7080609@gmail.com>
Date:	Fri, 22 Jun 2012 09:14:06 +0200
From:	Brice Goglin <brice.goglin@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	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 21/06/2012 21:24, Yinghai Lu a écrit :
> On Wed, Jun 20, 2012 at 10:56 PM, Brice Goglin <brice.goglin@...il.com> wrote:
>>> I suspected that could be other problem. intel system before
>>> sandbridge does not have IIO.
>>> they will have ioh instead, and one ioh would connect to two cpu sockets.
>>> but _PXM for root bus in dsdt only can return one value. Aka it is
>>> acpi spec limitation.
>> The machines I am talking about have two IOHs (one connected to each
>> socket). I only have an old 2.6.27 boot log at hand, I'll ask my admins
>> for more. Do you want the 2.6.27 dmesg anyway?
>>
> log from 2.6.27 should be good enough for this.
>
> 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).

Brice


View attachment "dmesg.txt" of type "text/plain" (195498 bytes)