linux-kernel - Re: Why such a big difference in init-time PCI resource call-paths (x86 vs x86

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Message-ID: <86802c440805011410q17c24653l292ccb6dad211a06@mail.gmail.com>
Date:	Thu, 1 May 2008 14:10:04 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	linux-pci@...ey.karlin.mff.cuni.cz, TJ <linux@...orld.net>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Why such a big difference in init-time PCI resource call-paths (x86 vs x86_64) ?

On Thu, May 1, 2008 at 1:11 PM, Andi Kleen <andi@...stfloor.org> wrote:
> On Thu, May 01, 2008 at 11:16:31AM -0700, Jesse Barnes wrote:
>  > On Wednesday, April 30, 2008 9:07 am TJ wrote:
>  > > In preparation for writing a Windows-style PCI resource allocation
>  > > strategy
>  > >
>  > >  - use all e820 gaps for IOMEM resources; top-down allocation -
>  > >
>  > > and thus giving devices with large IOMEM requirements more chance of
>  > > allocation in the 32-bit address space below 4GB (see bugzilla #10461),
>
>  I tried that some time ago and it turned out that some systems have
>  mappings in holes and don't boot anymore when you fill the holes too much.
>  But that was only considering e820. if you do this it might work if you
>  do it really like windows and consider all resources, including ACPI.

wonder if using holes in MTRR AND e820 could help...

YH
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