* Re: [gentoo-amd64] Is /proc/cpuinfo showing the actual frequency ?
[not found] ` <58965d8a0902190946k3f0be02nd3f4eef4827cc08a@mail.gmail.com>
@ 2009-02-19 19:05 ` Thanasis
0 siblings, 0 replies; only message in thread
From: Thanasis @ 2009-02-19 19:05 UTC (permalink / raw)
To: gentoo-amd64; +Cc: LKML
on 02/19/2009 07:46 PM Paul Hartman wrote the following:
> On Thu, Feb 19, 2009 at 10:55 AM, Justin <justin@j-schmitz.net> wrote:
>> Thanasis schrieb:
>>> on 02/19/2009 06:23 PM Justin wrote the following:
>>>> Thanasis schrieb:
>>>>
>>>>> # uname -a
>>>>> Linux wolfdale 2.6.28-gentoo-r2 #1 SMP PREEMPT Wed Feb 18 13:53:22 EET
>>>>> 2009 x86_64 Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz GenuineIntel
>>>>> GNU/Linux
>>>>>
>>>>> Overclocked the core 2 duo (E8400) from 3 to 4GHz using motherboard
>>>>> BIOS settings. In mswindblows I can see the overclocked frequency
>>>>> (when cpu is under load), in linux /proc/cpuinfo never shows beyond the
>>>>> stock 3GHz value.
>>>>>
>>>>> Q: Is /proc/cpuinfo showing the actual frequency?
>>>>>
>>>>>
>>>> Do you have frequency scaling active?
>>> Yes, but the /proc/cpuinfo I showed, was with the max frequency ever
>>> displayed (under load).
>>>
>> AFAIK the scaling will interfere with OC. Try to disable it and check
>> again.
>
> I just did some googling and it seems that frequency scaling in linux
> only works with the stock speed steps, not the OC'ed speed.
I bet if I disable frequency scaling from BIOS, it will show 4GHz, because the
funny thing is that inside a fully VM (guest) it shows the "real" frequency ;-)
# cat cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
stepping : 10
cpu MHz : 4050.236
cache size : 6144 KB
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
clflush dts mmx fxsr sse sse2 ss syscall nx lm pni ds_cpl cx16 xtpr lahf_lm
bogomips : 8111.05
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 : 23
model name : Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
stepping : 10
cpu MHz : 4050.236
cache size : 6144 KB
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
clflush dts mmx fxsr sse sse2 ss syscall nx lm pni ds_cpl cx16 xtpr lahf_lm
bogomips : 8101.80
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
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