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Old 03-27-2011, 09:44 AM   #1
drManhattan
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Registered: Aug 2010
Location: Warsaw, Poland
Distribution: Ubuntu 10.04 LTS on IBM Lenovo R61e, RHEL5-6,SLES10-11
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CPU info disproportion


Hi

I don't why my linux shows me different value of cpu speed then it actually has.
From the code below I can understand :
- CPU T7100 1.80Ghz of speed
- 2 CPU physical 'processor 0' and 'processor 1'
- cpu family is 686 (cpu family : 6)
- cpu0 800Mhz
- cpu1 800Mhz

Why linux shows me that 'cpu0 800Mhz' and 'cpu1 800Mhz' ?
I already checked that in BIOS cpu speed is 1.80Ghz.

Code:
root@ibmr61e:/proc# cat cpu*
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 15
model name	: Intel(R) Core(TM)2 Duo CPU     T7100  @ 1.80GHz
stepping	: 13
cpu MHz		: 800.000
cache size	: 2048 KB
physical id	: 0
siblings	: 2
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 pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority
bogomips	: 3591.02
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 Duo CPU     T7100  @ 1.80GHz
stepping	: 13
cpu MHz		: 800.000
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 1
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 pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority
bogomips	: 3591.04
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:
 
Old 03-27-2011, 09:53 AM   #2
johnsfine
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Registered: Dec 2007
Distribution: Centos
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It shows you the current CPU speed, not the max speed.

To reduce power and heat, most computers automatically reduce their CPU speed when few CPU cycles are being used and increase it again when more CPU cycles are needed.

There are a variety of different programs available in Linux for managing that adjustment of CPU speed. I don't recall which of those programs is the default in Ubuntu.

The 800MHz is likely the minimum speed supported by your motherboard and/or CPU. I assume your system was nearly idle for at least the few seconds before you looked at cpuinfo, so the CPU speed had been reduced to minimum.

Last edited by johnsfine; 03-27-2011 at 09:58 AM.
 
Old 03-27-2011, 10:20 AM   #3
drManhattan
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Registered: Aug 2010
Location: Warsaw, Poland
Distribution: Ubuntu 10.04 LTS on IBM Lenovo R61e, RHEL5-6,SLES10-11
Posts: 262

Original Poster
Rep: Reputation: 1
THx for help.
 
  


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