linux-kernel - Re: SNB PCI root information

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Message-ID: <CAOPLpQeJTfB2UNy3O9FgRCyZb=LyMqd0SOsz7qDM0Ur_sfeNhg@mail.gmail.com>
Date:	Mon, 18 Jun 2012 18:30:21 -0400
From:	Ulrich Drepper <drepper@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, 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

On Sat, Jun 16, 2012 at 5:56 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> If ACPI provides a perfectly usable generic way to describe this
> topology and the vendor BIOS doesn't bother to use it, I'm not very
> interested in trying to compensate for that BIOS deficiency by adding
> a bunch of non-portable CPU-specific gunk to Linux.

The problem is that all machines get this wrong.  I've tested varies
models from Dell and HP and none of them have the _PXM entry and the
local_cpus fields are wrong.  If there is a reasonably sane way to
compensate for broken BIOSes it should be considered.  We all know how
good BIOS authors are...
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