Martin Herrman schrieb: > > > 2009/2/19 Thanasis <[email protected] > <mailto:[email protected]>> > > # 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? > > # 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 : 2997.000 > cache size : 6144 KB > physical id : 0 > siblings : 2 > core id : 0 > cpu cores : 2 > apicid : 0 > initial apicid : 0 > 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 pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm > constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl > vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm tpr_shadow > vnmi flexpriority > bogomips : 8099.96 > 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 : 2997.000 > cache size : 6144 KB > physical id : 0 > siblings : 2 > core id : 1 > cpu cores : 2 > apicid : 1 > initial apicid : 1 > 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 pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm > constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl > vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm tpr_shadow > vnmi flexpriority > bogomips : 8099.74 > clflush size : 64 > cache_alignment : 64 > address sizes : 36 bits physical, 48 bits virtual > power management: > > > I have noticed exactly the same while overclocking my Q9300 from it's > stock 2.5 GHZ to 3.2 GHZ. Compilation / encode transactions do take much > less time, so I assume that the BIOS information is correct and the > /proc/ entry is false.
If you downstep your cpu it is shown: model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 But perhaps it just read the step and knows which frequency belongs to that.
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