Arch Linux

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

kernel showing 1 cpu only in duo core 2 [SOLVED]

hey, I've search for help but all I get in hyperthreading..

Intel says it's multi-core(dualcore)

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
stepping        : 6
cpu MHz         : 2000.139
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 apic 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 aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
bogomips        : 4001.95
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

is this info right??

Last edited by funkmuscle (2010-11-03 11:42:28)

wonder

Developer

From: Bucharest, Romania

Registered: 2006-07-05

Posts: 5,941

Website

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

check out in the bios to see if multicore is enabled. i know i have such option in my dell laptop

---

Give what you have. To someone, it may be better than you dare to think.

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

no, the bois doesn't have that option.. Yet the Sony site and specs says the my cpu is dual-core but on linux, it shows only single....

ChoK

Member

From: France

Registered: 2008-10-01

Posts: 346

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

Is this the whole output of cat /proc/cpuinfo ?
Dual core system should have "processor 0" + infos then "processor 1" + exact same infos

can you post the output of "grep processor /proc/cpuinfo"

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wonder

Developer

From: Bucharest, Romania

Registered: 2006-07-05

Posts: 5,941

Website

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

no, the bois doesn't have that option.. Yet the Sony site and specs says the my cpu is dual-core but on linux, it shows only single....

dude, i think i saw some article about that. sony is disabling multicore for some purpose... but i don't remember were i read it. did you tried to do a bios update?

Last edited by wonder (2010-11-02 11:47:57)

---

Give what you have. To someone, it may be better than you dare to think.

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

no, the bois doesn't have that option.. Yet the Sony site and specs says the my cpu is dual-core but on linux, it shows only single....

dude, i think i saw some article about that. sony is disabling multicore for some purpose... but i don't remember were i read it. did you tried to do a bios update?

are you serious? that would suck large...:(

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

Is this the whole output of cat /proc/cpuinfo ?
Dual core system should have "processor 0" + infos then "processor 1" + exact same infos

can you post the output of "grep processor /proc/cpuinfo"

will try that when I'm home

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

here are the specs from Sony:
SPECIFICATIONS
Essentials
Status    Launched
Processor Number    T7200
# of Cores    2
# of Threads    2
Clock Speed    2 GHz
L2 Cache    4 MB
Bus/Core Ratio    12.0
FSB Speed    667 MHz
FSB Parity    No
Instruction Set    64-bit
Embedded Options Available    No
Supplemental SKU    No
Lithography    65 nm
Max TDP    34 W
VID Voltage Range    1.0375V-1.300V

skunktrader

Member

From: Brisbane, Australia

Registered: 2010-02-14

Posts: 1,586

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

dmesg | grep "processors activated"

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

Total of 1 processors activated (4002.25 BogoMIPS).

another description I found online said 1 processor(2 cores)

Last edited by funkmuscle (2010-11-02 20:53:48)

skunktrader

Member

From: Brisbane, Australia

Registered: 2010-02-14

Posts: 1,586

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

The kernel is only detecting one of the cores

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

is there a fix? stock kernel

lilsirecho

Veteran

Registered: 2003-10-24

Posts: 5,000

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

This is my computer dats....Post yours...

o
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 2.80GHz
stepping        : 4
cpu MHz         : 2800.055
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr pdcm lahf_lm
bogomips        : 5602.44
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 2.80GHz
stepping        : 4
cpu MHz         : 2800.055
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 1
initial apicid  : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr pdcm lahf_lm
bogomips        : 5602.41
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

[root@n6re ~]#

---

Prediction...This year will be a very odd year!
Hard work does not kill people but why risk it: Charlie Mccarthy
A man is not complete until he is married..then..he is finished.
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funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

This is my computer dats....Post yours...

o
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 2.80GHz
stepping        : 4
cpu MHz         : 2800.055
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr pdcm lahf_lm
bogomips        : 5602.44
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 2.80GHz
stepping        : 4
cpu MHz         : 2800.055
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 1
initial apicid  : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr pdcm lahf_lm
bogomips        : 5602.41
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

[root@n6re ~]#

I did post at the start of this thread:
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
stepping        : 6
cpu MHz         : 2000.139
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 apic 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 aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
bogomips        : 4001.95

djgera

Developer

From: Buenos Aires - Argentina

Registered: 2008-12-24

Posts: 723

Website

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

Bad ACPI tables in BIOS.

Try to play with some ACPI options in BIOS or with APIC options if you have.

You can try to boot with some acpi and apic debug info in kernel command line parameters like: acpi.debug_layer=0x20000000 and/or apic=debug or apic=verbose

combuster

Member

From: Serbia

Registered: 2008-09-30

Posts: 711

Website

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

I've heard of similar problem from a dude from local tech forum, said that Arch found only 2 processors instead of 4 on his Q9300

We tried with several kernel parametars but to no avail...

/edit: I agree that that probable cause could be bad ACPI tables, but this is most certainly a regression introduced with 2.6.35 kernel (worked ok previously).

for OP : Could you try with LTS kernel from repos ?

Last edited by combuster (2010-11-02 23:59:54)

funkmuscle

Member

Registered: 2006-02-09

Posts: 547

Re: kernel showing 1 cpu only in duo core 2 [SOLVED]

ok, added acpi=off and got this:
cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
stepping        : 6
cpu MHz         : 2000.283
cache size      : 4096 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
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 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
bogomips        : 4002.25
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
stepping        : 6
cpu MHz         : 2000.283
cache size      : 4096 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 1
initial apicid  : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
bogomips        : 4001.69
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

got tons of acpi errors about the fan etc... did I fix one issue and created a new one? Don't wanna mark solved yet.

CHANGED MY MIND, MARKING THIS AS SOLVED... system runs way better with acpi=off
thanx guys!

Last edited by funkmuscle (2010-11-03 11:43:34)