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Ph0eniX
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Joined: 24 Sep 2004
Posts: 502
Location: New York, U.S.
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 Posted: Tue Sep 05, 2006 3:14 pm Post subject: Strange MHz reading on a P4 |
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When I do:
it reports:
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processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 0
model name : Intel(R) Pentium(R) 4 CPU 1400MHz
stepping : 7
cpu MHz : 2200.000
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
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 up
bogomips : 2795.06
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It's supposed to be a 1.4GHz CPU (it's never been OC'd) - I wouldn't mind it really running 2.2GHz but I have a feeling that that's a bogus reading. Can anyone explain this behavior?
Thanks! |
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Ph0eniX
Guru
Joined: 24 Sep 2004
Posts: 502
Location: New York, U.S.
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| Posted: Tue Sep 05, 2006 7:30 pm Post subject: Re: Strange MHz reading on a P4 |
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It seems to be related to p4_clockmod that I'm using in the kernel. cpufreq-info reports:
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cpufrequtils 001: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
driver: p4-clockmod
CPUs which need to switch frequency at the same time: 0
hardware limits: 550 MHz - 2.20 GHz
available frequency steps: 550 MHz, 825 MHz, 1.10 GHz, 1.38 GHz, 1.65 GHz, 1.93 GHz, 2.20 GHz
available cpufreq governors: performance
current policy: frequency should be within 550 MHz and 2.20 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.20 GHz (asserted by call to hardware).
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Does that mean that my CPU is really running at 2.2GHz? |
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mbar
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Joined: 19 Jan 2005
Posts: 1991
Location: Poland
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| Posted: Wed Sep 06, 2006 5:14 am Post subject: |
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| Run memtest86+ and see what it reports as a CPU speed. |
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Mad Merlin
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Joined: 09 May 2005
Posts: 1155
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| Posted: Wed Sep 06, 2006 1:40 pm Post subject: Re: Strange MHz reading on a P4 |
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That suggests that it's actually running at 1.4 GHz, not 2.2 GHz. Bogomips on most modern x86 processors is ~2x the clock frequency.
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Game! - Where the stick is mightier than the sword! |
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Ph0eniX
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Joined: 24 Sep 2004
Posts: 502
Location: New York, U.S.
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| Posted: Wed Sep 06, 2006 3:17 pm Post subject: Re: Strange MHz reading on a P4 |
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| Mad Merlin wrote: |
That suggests that it's actually running at 1.4 GHz, not 2.2 GHz. Bogomips on most modern x86 processors is ~2x the clock frequency. |
I have a little app that verifies the bogomips (called bogo) and it's reporting 1850.
I'll run memtest and report back. |
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