Re: nr_cpu_ids incorrect on AMD Quad-Core Opteron 8380

[Borislav Petkov]

On Tue, Feb 02, 2010 at 01:49:06PM +1300, zhiyi wrote:
> The dmesg relevant to nr_cpu_ids of the quad socket is:
> 
> [    0.000000] NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:32 nr_node_ids:4
> 

No, this is not the relevant info. I was actually looking for the MADT ACPI
table and whether there are disabled entries like so:

[    0.000000] ACPI: LAPIC (acpi-id[0x03] lapic-id[0x02] enabled)
[    0.000000] ACPI: LAPIC (acpi-id[0x04] lapic-id[0x03] enabled)
[    0.000000] ACPI: LAPIC (acpi-id[0x05] lapic-id[0x84] disabled)
[    0.000000] ACPI: LAPIC (acpi-id[0x06] lapic-id[0x85] disabled)

because if there are, nr_cpu_ids will include those when you don't boot
with "possible_cpus=N".

Anyhow, you can read this for more info: http://www.pubbs.net/kernel/200912/64310/

-- 
Regards/Gruss,
    Boris.
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