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Old 01-06-2009, 08:59 PM   #1
jmite
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Registered: Jun 2008
Distribution: Ubuntu
Posts: 266

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2.2GHz chip comes up as 800MHZ in cpuinfo


In my /proc/cpuinfo on my Ubuntu 8.10 box, the processor is listed as being an Intel T5900 2.2GHz, but under "cpu MHz" it only lists 800.0 MHz. Is this normal? Will this slow down my system at all?

It's probably fine, I just like to be sure...

Thanks!

Here's my /proc/cpuinfo file

Code:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 15
model name	: Intel(R) Core(TM)2 Duo CPU     T5900  @ 2.20GHz
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
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 nopl pni monitor ds_cpl est tm2 ssse3 cx16 xtpr lahf_lm
bogomips	: 4388.93
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     T5900  @ 2.20GHz
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
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 nopl pni monitor ds_cpl est tm2 ssse3 cx16 xtpr lahf_lm
bogomips	: 4388.98
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:
 
Old 01-06-2009, 09:05 PM   #2
jay73
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Registered: Nov 2006
Location: Belgium
Distribution: Ubuntu 11.04, Debian testing
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Yes, that is normal. What you are seeing are the effects of cpufreq, which automatically slows your CPU down whenever it is not doing anything intensive. Saves on the energy bill and keeps your computer running cooler. You can actually manipulate these settings (as well as keep an eye on the evolution of CPU speed - try launching an app to see what I mean) if you install the CPU Freq applet: set higher default, set fixed default, etc. Personally, I keep it in "On demand" mode so it scales automatically. If you had an application that required highly precise timing, it would be a good idea to use "Performance" mode instead but in most situations, you will not notice much of a delay as your CPU can jump from 800Mhz to 2.2Ghz in no time at all.

Last edited by jay73; 01-06-2009 at 11:18 PM.
 
Old 01-06-2009, 10:10 PM   #3
jmite
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Registered: Jun 2008
Distribution: Ubuntu
Posts: 266

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Rep: Reputation: 36
Never knew that. Thanks so much!
 
  


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