Messages in this thread | | | Date | Wed, 22 Mar 2006 18:35:46 +0100 | From | Knut Petersen <> | Subject | Re: [BUG] wrong bogomips values with kernel 2.6.16 |
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Linus Torvalds wrote:
>On Wed, 22 Mar 2006, Knut Petersen wrote: > > >>All Pentium M, Xeon up to model 2 and the P6 family increment with every >>internal processor cycle. >> >> > >Just to humor me. Try the bogomips loop in user space with something like >the appended (make sure the frequency is fixed to the lowest frequency). > > Linus > > No problem ...
linux:~ # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 1867000 1600000 1333000 1067000 800000
linux:~ # echo 800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat /proc/cpuinfo;./test processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.86GHz stepping : 8 cpu MHz : 800.000 cache size : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2 bogomips : 3730.27
TSC: 798.307872 MHz
linux:~ # echo 1067000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat /proc/cpuinfo;./test processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.86GHz stepping : 8 cpu MHz : 1067.000 cache size : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2 bogomips : 4975.25
TSC: 1064.407897 MHz
linux:~ # echo 1333000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat /proc/cpuinfo;./test processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.86GHz stepping : 8 cpu MHz : 1333.000 cache size : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2 bogomips : 6215.57
TSC: 1330.511688 MHz
linux:~ # echo 1600000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat /proc/cpuinfo;./test processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.86GHz stepping : 8 cpu MHz : 1600.000 cache size : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2 bogomips : 7460.55
TSC: 1596.612533 MHz
linux:~ # echo 1867000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat /proc/cpuinfo;./test processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.86GHz stepping : 8 cpu MHz : 1867.000 cache size : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2 bogomips : 8705.53
TSC: 1862.715048 MHz
I tried kernel _2.6.15_ too - it´s even more broken:
linux:~ # cat /proc/cpuinfo;./test processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.86GHz stepping : 8 cpu MHz : 4347.853 cache size : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2 bogomips : 8702.35
TSC: 1863.086854 MHz
Isn´t that nice? I´m able to overclock my 1.86 MHz cpu to stable 4.35 MHz with just a passive heatsink ;-)))
cu, Knut - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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