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system shows desabled processors

 
Nuwan Alwis
Valued Contributor

system shows desabled processors

Hi All gurus,
One of or systems shows that there are disable cores at the start up.
Eg:

Aug 20 16:56:26 ns102 kernel:
Aug 20 16:56:26 ns102 kernel: LAPIC (acpi_id[0x0004] id[0x4] enabled[0])
Aug 20 16:56:26 ns102 kernel: CPU 1 (0x0400) disabled
Aug 20 16:56:26 ns102 kernel: LAPIC (acpi_id[0x0002] id[0x2] enabled[0])
Aug 20 16:56:26 ns102 kernel: CPU 2 (0x0200) disabled
Aug 20 16:56:26 ns102 kernel: LAPIC (acpi_id[0x0006] id[0x6] enabled[1])
Aug 20 16:56:26 ns102 kernel: CPU 3 (0x0600) enabledProcessor #6 Pentium(tm) Pro APIC version 20
Aug 20 16:56:26 ns102 kernel:
Aug 20 16:56:26 ns102 kernel: LAPIC (acpi_id[0x0001] id[0x1] enabled[1])
Aug 20 16:56:26 ns102 kernel: CPU 4 (0x0100) enabledProcessor #1 Pentium(tm) Pro APIC version 20
Aug 20 16:56:26 ns102 kernel:
Aug 20 16:56:26 ns102 kernel: LAPIC (acpi_id[0x0005] id[0x5] enabled[0])
Aug 20 16:56:26 ns102 kernel: CPU 5 (0x0500) disabled
Aug 20 16:56:26 ns102 kernel: LAPIC (acpi_id[0x0003] id[0x3] enabled[0])
Aug 20 16:56:26 ns102 kernel: CPU 6 (0x0300) disabled
Aug 20 16:56:26 ns102 kernel: LAPIC (acpi_id[0x0007] id[0x7] enabled[1])
Aug 20 16:56:26 ns102 kernel: CPU 7 (0x0700) enabledProcessor #7 Pentium(tm) Pro APIC version 20
Aug 20 16:56:26 ns102 kernel:
Aug 20 16:56:26 ns102 kernel: IOAPIC (id[0x8] address[0xfec00000] global_irq_base[0x0])
Aug 20 16:56:26 ns102 kernel: IOAPIC (id[0x9] address[0xfec80000] global_irq_base[0x18])
Aug 20 16:56:26 ns102 kernel: INT_SRC_OVR (bus[0] irq[0x0] global_irq[0x2] polarity[0x1] trigger[0x1])
Aug 20 16:56:26 ns102 kernel: INT_SRC_OVR (bus[0] irq[0x9] global_irq[0x9] polarity[0x1] trigger[0x3])
Aug 20 16:56:26 ns102 kernel: LAPIC_NMI (acpi_id[0x00ff] polarity[0x0] trigger[0x0] lint[0x1])
Aug 20 16:56:26 ns102 kernel: 8 CPUs total
Aug 20 16:56:26 ns102 kernel: Local APIC address fee00000
Aug 20 16:56:26 ns102 kernel: Enabling the CPU's according to the ACPI table
Aug 20 16:56:26 ns102 kernel: Intel MultiProcessor Specification v1.4
Aug 20 16:56:26 ns102 kernel: Virtual Wire compatibility mode.
Aug 20 16:56:26 ns102 kernel: OEM ID: HP Product ID: PROLIANT APIC at: 0xFEE00000
Aug 20 16:56:26 ns102 kernel: I/O APIC #8 Version 32 at 0xFEC00000.
Aug 20 16:56:26 ns102 kernel: I/O APIC #9 Version 32 at 0xFEC80000.
Aug 20 16:56:26 ns102 kernel: Processors: 4

also
according to top output there are 4 CPU s
which is CPU00-CPU03

i want to know what are these disabled cores
and should i see all cores on top output

Thanks in advance.
5 REPLIES
JKytsi
Honored Contributor

Re: system shows desabled processors

How many CPUs Your kernel supports ?
Remember to give Kudos to answers! (click the KUDOS star)

You can find me from Twitter @JKytsi
Nuwan Alwis
Valued Contributor

Re: system shows desabled processors

This is 2.4 SMP kernal.
Btw i ran the smart start diag and found this system only has 2 dual core CPUs installed on it. So what ever the TOP output shows is correct. Still i need to know why does it puts a message at the logs as total 8 CPUs.
Matti_Kurkela
Honored Contributor

Re: system shows desabled processors

Maybe your system has two more empty CPU sockets. The ability to detect empty CPU sockets as "disabled CPUs" might be related to CPU hot-plugging ability. It would require both hardware and OS kernel support.

What's the system model?

MK
MK
Nuwan Alwis
Valued Contributor

Re: system shows desabled processors

Maybe you r correct. this is a DL350 G5 server.
Nuwan Alwis
Valued Contributor

Re: system shows desabled processors

This is a linux way of probing hardware and dose not give actual info about the system attached hardware at this stage.