[SOLVED] /proc/cpuinfo output

schneidz · 06-24-2010, 03:33 PM

hi, i am pretty sure that an intel atom 230 is single core and an intel atom 330 is dual core but the /proc/cpuinfo for them seems wrong:

Code:

[schneidz@hyper ~]$ cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU  230   @ 1.60GHz
stepping	: 2
cpu MHz		: 1599.996
cache size	: 512 KB
physical id	: 0
siblings	: 2
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 mtrr pge mca cmov pat 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 tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm
bogomips	: 3200.08
clflush size	: 64
cache_alignment	: 64
address sizes	: 32 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU  230   @ 1.60GHz
stepping	: 2
cpu MHz		: 1599.996
cache size	: 512 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
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 mtrr pge mca cmov pat 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 tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm
bogomips	: 3199.52
clflush size	: 64
cache_alignment	: 64
address sizes	: 32 bits physical, 48 bits virtual
power management:

Code:

xbmc@XBMCLive:~$ cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU  330   @ 1.60GHz
stepping	: 2
cpu MHz		: 1600.006
cache size	: 512 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
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 mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm
bogomips	: 3200.01
clflush size	: 64
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU  330   @ 1.60GHz
stepping	: 2
cpu MHz		: 1600.006
cache size	: 512 KB
physical id	: 0
siblings	: 4
core id		: 1
cpu cores	: 2
apicid		: 2
initial apicid	: 2
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 mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm
bogomips	: 3200.10
clflush size	: 64
power management:

processor	: 2
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU  330   @ 1.60GHz
stepping	: 2
cpu MHz		: 1600.006
cache size	: 512 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 2
apicid		: 1
initial apicid	: 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 mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm
bogomips	: 3199.98
clflush size	: 64
power management:

processor	: 3
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU  330   @ 1.60GHz
stepping	: 2
cpu MHz		: 1600.006
cache size	: 512 KB
physical id	: 0
siblings	: 4
core id		: 1
cpu cores	: 2
apicid		: 3
initial apicid	: 3
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 mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm
bogomips	: 3200.05
clflush size	: 64
power management:

so what does this mean ?

AlucardZero · 06-24-2010, 03:39 PM

hyper-threading. shows up as another core. http://ark.intel.com/Product.aspx?id=35641

johnsfine · 06-24-2010, 03:47 PM

Quote:

Originally Posted by AlucardZero

hyper-threading.

Yes. (hyper-threading is the answer to the OP's question).

Quote:

shows up as another core.

Not quite.

It shows up as another sub table of "processor" information in the contents of /proc/cpuinfo, but you can tell it is not another core.

Look at the lines saying core id. It doesn't matter exactly what numbers you see there. It matters how many different numbers you see across all of those lines for one physical processor.

For the 230, you see two such lines, but both with the same number, so you have one core.

For the 330, you see four such lines but with only two different numbers, so two cores.

The two different numbers for the 330 were 0, and 1 which is sensible. But I have seen a case where the two different numbers were 0 and 3 each appearing twice with 1 and 2 not appearing. Strange as that was, it still meant two cores with hyperthreading.

Edit: Fixed super stupid typo.

schneidz · 06-24-2010, 04:03 PM

Quote:

Originally Posted by johnsfine

...
For the 230, you see two such lines, but both with the same number, so you have 2 cores...

according to wikipedia the n230 should be single-code ?:
http://en.wikipedia.org/wiki/Intel_a...om_N2xx_series

johnsfine · 06-24-2010, 04:17 PM

Quote:

Originally Posted by schneidz

according to wikipedia the n230 should be single-code ?:
http://en.wikipedia.org/wiki/Intel_a...om_N2xx_series

Sorry about the typo. Tiny typos that change the fundamental point of the whole post are very frustrating.

I meant one, I thought "one" as I typed and somehow 2 appeared.