/proc/cpuinfo and other stuff only indicate one core of my Intel core Duo

[psicfr]

Hello,

I am running Fedora16 on my macbook and cat /proc/cpuinfo, or gnome-systement-monitor or mpstat -A only show me one core of my Intel Core Duo T7400 which I believed was with 2 core.
I don't know how to know if the second core is broken, unavailable or what ?

[Adunaic]

What is your laptop. What version of Macbook / how old?

[psicfr]

Macbook 2,1

[george_toolan]

Please check your EFI and make sure SMP is enabled. Also make sure you don't use any kernel parameters which might limit the number of cores like nosmp or maxcpus=1

dmesg | grep command

[psicfr]

from mid-2007

---------- Post added at 08:04 AM ---------- Previous post was at 08:00 AM ----------

psic]# dmesg | grep command
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.3.7-1.fc16.x86_64 root=UUID=53cf5d1d-e58a-4be0-97e9-a4143cbda413 ro rd.md=0 rd.lvm=0 rd.dm=0 quiet SYSFONT=latarcyrheb-sun16 rhgb rd.luks=0 KEYTABLE=fr nolapic LANG=fr_FR.UTF-8 i915.modeset=1
[    0.052262] ACPI: EC: GPE = 0x17, I/O: command/status = 0x66, data = 0x62

what is SMP ? and how to make sure and check if it is enabled ?

[Adunaic]

So you should have two cores, could you paste the output of the following command on here please:

grep processor /proc/cpuinfo

[psicfr]

# grep processor /proc/cpuinfo 
processor	: 0

 cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 15
model name	: Intel(R) Core(TM)2 CPU         T7400  @ 2.16GHz
stepping	: 6
microcode	: 0xd1
cpu MHz		: 1833.337
cache size	: 4096 KB
physical id	: 0
siblings	: 1
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc up arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow
bogomips	: 4322.47
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual

[stevea]

That is peculiar. Can you post
dmesg | grep -i smp

[psicfr]

# dmesg | grep -i smp
[    0.000000] Linux version 3.3.7-1.fc16.x86_64 (mockbuild@x86-11.phx2.fedoraproject.org) (gcc version 4.6.3 20120306 (Red Hat 4.6.3-2) (GCC) ) #1 SMP Tue May 22 13:59:39 UTC 2012
[    0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs
[    0.006112] SMP alternatives: switching to UP code
[    0.016213] Freeing SMP alternatives: 24k freed
[    0.026086] SMP motherboard not detected.
[    0.026092] SMP disabled

What's smp ?

[DBelton]

Do you really need the nolapic kernel parameter? That is what is limiting you to 1 cpu.

Edit:

I meant to say that might be what is limiting you to 1 CPU instead. Pretty major typo.

[psicfr]

I need something in my grub to start... I use to put acpi=off because it doesn not start without it, but I had no battery monitor and other stuff, so it's work with nolapic...but I don't know what else to put ?

[DBelton]

have you tried it lately without those parameters? There have been some updates to the kernel, and it possibly might work properly for you without those parameters now.

[psicfr]

yes I tried with any parameters, and it doesn't boot anymore.

[marko]

Originally Posted by psicfr

What's smp ?

smp == Symmetric Multi Processor

It's just the term for having more than one core which share a common pool of memory

http://en.wikipedia.org/wiki/Symmetric_multiprocessing

[george_toolan]

On a PC it is possible to disable SMP in BIOS, so please make sure it's enabled in your Mac EFI.

SMP motherboard not detected.

According to this your "motherboard" does not support SMP, so I'm guessing it's either disabled or you'll need different kernel options.