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SubjectRe: 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@firstfloor.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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