Messages in this thread | | | Date | Thu, 19 Feb 2009 21:05:32 +0200 | From | Thanasis <> | Subject | Re: [gentoo-amd64] Is /proc/cpuinfo showing the actual frequency ? |
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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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