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    SubjectRe: [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box v2
    On Tue, Feb 26, 2008 at 3:31 PM, Ravikiran Thirumalai <kiran@scalemp.com> wrote:
    > On Tue, Feb 26, 2008 at 03:16:16PM -0800, Yinghai Lu wrote:
    > >On Tue, Feb 26, 2008 at 1:24 PM, Ravikiran Thirumalai <kiran@scalemp.com> wrote:
    > >>
    > >> On Tue, Feb 26, 2008 at 01:10:57PM -0800, Yinghai Lu wrote:
    > >> >On Tue, Feb 26, 2008 at 12:32 PM, Ravikiran Thirumalai
    > >> ><kiran@scalemp.com> wrote:
    > >> >> On Tue, Feb 26, 2008 at 11:00:58AM -0800, Yinghai Lu wrote:
    > >> >> >
    > >> >> >1. if acpi=off ?
    > >> >>
    > >> >> Well that is not a realistic scenario for any multi chassi NUMA machine,
    > >> >> since the proximity information is very important and turning acpi off
    > >> >> deprives the OS of this information.
    > >> >
    > >> >actually OS should detect the distance instead of rely on SLIT.
    > >>
    > >> How does it do that? ACPI SRAT is needed to determine this, and it wouldn't
    > >> work if acpi=off.
    > >
    > >srat only have apicid to node mapping, and ram to node mapping.
    >
    > Which is very important for performance.
    >
    >
    > >
    > >for amd64 system, when acpi=off
    > >ram to node mapping can be retrieved from pci conf space
    >
    > I was referring to all types of numa systems, not just AMD. The pci config
    > space is amd specific. Multi chassi systems in particular would be
    > acpi SRAT based. Anyways.

    can you try x86.git#testing your vsmp to see if is_vsmp_box is working?

    http://people.redhat.com/mingo/x86.git/README

    YH


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