GNU/Linux Ubuntu showing 2 cores - CPU0 and CPU1

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casainho

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Hello :-)

When I open the "System monitor" I see a graph of two different CPUs, the 0 and the 1. Is this Atom processor dual core?
 
casainho said:
Hello :-)

When I open the "System monitor" I see a graph of two different CPUs, the 0 and the 1. Is this Atom processor dual core?
Click to expand...

interesting, any chance of a screenshot?
 
mad, do you have any other testing programs to confirm this?
 
The Atom N270 has Hyperthreading, which is interpreted like two virtual cores by the system. You can check yourself using cat /proc/cpuinfo which will show this. Notice it says cores=1 but siblings=2.

Code: 
processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 28
model name      : Intel(R) Atom(TM) CPU N270   @ 1.60GHz
stepping        : 2
cpu MHz         : 800.000
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
 
May be something wrong with ACPI... for example, I can't set them bellow to 800MHz - 50%.I would go to 12% or 25% as looks possible on this ACPI info...
 
Well, I did follow this guide for have cpu control:
http://wiki.eeeuser.com/getting_ubuntu_ ... or_scaling

I just see this:

cas@cas-laptop:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU N270 @ 1.60GHz
stepping : 2
cpu MHz : 1600.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
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 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc arch_perfmon pebs bts pni monitor ds_cpl est tm2 ssse3 xtpr lahf_lm
bogomips : 3196.56
clflush size : 64

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU N270 @ 1.60GHz
stepping : 2
cpu MHz : 1600.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
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 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc arch_perfmon pebs bts pni monitor ds_cpl est tm2 ssse3 xtpr lahf_lm
bogomips : 3191.98
clflush size : 64

cas@cas-laptop:~$
 
Also Linpus see twu cpu, press "Ctrl+Alt+Canc" for start "System Monitor" utility and click on "System" or "Resources" tab.
Only a simulation of HT tecnology.
 
A cpu with hyperthreading enabled, such as the Atom, will appear to the operating system as having two cores. This is normal.

The cpu does not, however, have two cores. There is a performance benefit to hyperhtreading, but it is not the same as true dual-core architecture.

The dual core Atom will be released later this year.

http://www.hexus.net/content/item.php?item=13494

(Will that also be HT enabled and report as four cores? Apparently so.)
 
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