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Old 01-13-2009, 10:06 AM   #1
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dmidecode shows CPU Status: Populated, Disabled By User

Does anyone know what this means?
Do I need to be running SMP kernel to see the second processor?
Do I need to do something in the BIOS to enable this processor?
Is this just a ghost handle from the primary processor?

Handle 0x0005, DMI type 4, 35 bytes
Processor Information
Socket Designation: Socket 939
Type: Central Processor
Family: Unknown
Manufacturer: Unknown
ID: 00 00 00 00 00 00 00 00
Version: AMD Athlon(tm) 64 Processor 3500+
Voltage: 1.4 V
External Clock: 200 MHz
Max Speed: 3000 MHz
Current Speed: 2200 MHz
Status: Populated, Disabled By User
Upgrade: Socket 939
L1 Cache Handle: 0x000C
L2 Cache Handle: 0x000E
L3 Cache Handle: Not Provided
Serial Number:
Asset Tag:
Part Number:

Old 01-13-2009, 12:01 PM   #2
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Try viewing the output of lshw -C processor it does a better job of displaying CPU information so you can get a better picture of what is going on.

What kernel are you running ? uname -a
Old 01-14-2009, 08:44 AM   #3
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[root]# ./lshw -C processor
description: CPU
product: AMD Athlon(tm) 64 Processor 3500+
vendor: Advanced Micro Devices [AMD]
physical id: 4
bus info: cpu@0
version: AMD Athlon(tm) 64 Processor 3500+
slot: Socket 939
size: 2200MHz
capacity: 3GHz
width: 64 bits
clock: 200MHz
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt x86-64 3dnowext 3dnow pni lahf_lm cpufreq
*-cpu:1 DISABLED
description: CPU
vendor: Unknown
physical id: 5
bus info: cpu@1
version: AMD Athlon(tm) 64 Processor 3500+
slot: Socket 939
size: 2200MHz
capacity: 3GHz
clock: 200MHz

[root]# uname -a
Linux machinename 2.6.9-78.0.8.EL #1 Wed Nov 5 06:58:59 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

I downloaded the smp kernel, rebooted with it. /proc/cpuinfo only showed one CPU.
In the process I looked through the BIOS setup for anything that would indicate dual CPU's and did not find anything.
I know there are not two physical CPU's in the box, and I never thought I had the dual core Athlon, but its funny how CPU1 is showing up disabled with its own physical id and handle.
Old 01-14-2009, 08:58 AM   #4
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There are different ways to disable a cpu/core. On of them being passing the maxcpus=N kernel option at boot time. Anyway, check under /sys/devices/system/cpu. In a dual-core system you should have two directories: cpu0 and cpu1. The cpu1 dir should contain a file called "online". If the content of the file is 0, the core is actually disabled, if the content is 1, the core is enabled (online). If you want to re-enable the core, just do
echo 1 > /sys/devices/system/cpu/cpu1/online
then you have to investigate how, who and why the core was disabled.


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