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SubjectRe: disabled APICs being counted as processors ?
On Sat, Jan 25, 2014 at 08:41:07AM +0100, Ingo Molnar wrote:
>
> * Dave Jones <davej@redhat.com> wrote:
>
> > I have a system with 4 cores (configured with CONFIG_NR_CPUS=4) that shows during boot..
> >
> > [ 0.000000] smpboot: 8 Processors exceeds NR_CPUS limit of 4
> >
> > it looks like this is because..
> >
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x04] enabled)
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x06] enabled)
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0xff] disabled)
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0xff] disabled)
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0xff] disabled)
> > [ 0.000000] ACPI: LAPIC (acpi_id[0x08] lapic_id[0xff] disabled)
> >
> > Should the CPU counting code be ignoring those disabled APICs ?
>
> Hm, so to the kernel it looks like as if those were 'possible CPUs',
> in theory hotpluggable. Not sure what they are - disabled cores in an
> 8-core system? Or BIOS reporting crap?
>
> But perhaps the boot message could be improved to say something like:
>
> > [ 0.000000] smpboot: 8 possible processors exceeds NR_CPUS limit of 4

It's not possible though. It's an i5-4670T, in a single socket board.
It doesn't even have hyperthreading. http://ark.intel.com/products/75050/Intel-Core-i5-4670T-Processor-6M-Cache-up-to-3_30-GHz

Dave




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