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SubjectRe: Slower CPU frequency reported by the kernel
On Fri, 2 Feb 2007 12:11:25 +0100
"Francis Moreau" <francis.moro@gmail.com> wrote:

> Hi,
>
> I'm using a PC with AMD 64 3000+ cpu which is theoricaly running at
> 2Ghz. But when looking at /proc/cpuinfo, the kernel reports that it
> runs only at 1Ghz:
>
> # cat /proc/cpuinfo
>
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 15
> model : 12
> model name : AMD Athlon(tm) 64 Processor 3000+
> stepping : 0
> cpu MHz : 1000.000
> cache size : 512 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm
> 3dnowext 3dnow ts fid vid ttp
> bogomips : 2004.89
>
> I tried with a 2.6.20-rc7 kernel and still have the same.
>
> What's going wrong ?


You are using frequency scaling(*) and "/proc/cpuinfo" reflects the
current speed.


(*) =
#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=y
CONFIG_CPU_FREQ_DEBUG=y
CONFIG_CPU_FREQ_STAT=m
CONFIG_CPU_FREQ_STAT_DETAILS=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=m
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m


Read "Documentation/cpu-freq/user-guide.txt" for more info.

--
Paolo Ornati
Linux 2.6.20-rc7 on x86_64
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