Re: Why such a big difference in init-time PCI resource call-paths (x86 vs x86_64) ?

[Yinghai Lu]

On Thu, May 1, 2008 at 1:11 PM, Andi Kleen <andi@xxxxxxxxxxxxxx> 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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