https://bugzilla.kernel.org/show_bug.cgi?id=57471
Summary: 12 core system configured for flat interrupt mode
Product: ACPI
Version: 2.5
Kernel Version: 3.8.2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Processors
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Sandy Bridge-E 6 core/HT (12 processors) is being configured in logical flat
mode.
>From dmesg:
[ 0.000000] ACPI: Local APIC address 0xfee00000
[ 0.000000] ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x04] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x06] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x08] lapic_id[0x08] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x09] lapic_id[0x09] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x0a] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x0b] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x00] disabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x00] disabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x00] disabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x00] disabled)
Once booted i checked the local apic's:
cpu 0 logical 01000000 physical 00000000
cpu 1 logical 02000000 physical 01000000
cpu 2 logical 04000000 physical 02000000
cpu 3 logical 08000000 physical 03000000
cpu 4 logical 10000000 physical 04000000
cpu 5 logical 20000000 physical 05000000
cpu 6 logical 40000000 physical 06000000
cpu 7 logical 80000000 physical 07000000
cpu 8 logical 00000000 physical 08000000
cpu 9 logical 00000000 physical 09000000
cpu 10 logical 00000000 physical 0a000000
cpu 11 logical 00000000 physical 0b000000
I would have expected cluster mode with logical id's (in hex):
01,02,04,08,11,12,14,18,21,22,24,28
x0 isnt a valid cluster id as the lower nibble is a mask meaning only 1,2,4,8
are selectable.
Flat mode is only capable of supporting 8 processors or less.
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