Hi,
> Only simple check value of edx.
> Well, unless CPU uses CPUID.5.EDX[31:20], the reserved area.
You mean that powertop is not correctly reading the states? Do you
mean that the BIOS reports better that the CPU ?
--------------------------
*Mahmood Naderan*
On Sat, Jun 20, 2009 at 7:26 AM, Edward Shao <laface.tw@xxxxxxxxx> wrote:
>
> Hi Mahmood,
>
> So far as I know, if your CPU is Intel, powertop maybe cause a misleading.
> Powertop uses CPUID.5.EDX to check CPU supported C states.
> According Intel's spec (Intel Processor Identification and the CPUID
> Instruction (Application Note 485), a CPU only has
>
> C0, C1, C2, C3, C4 (prior Core i7)
> C0, C1, C2, C6, C7 (Core i7 and subsequent)
>
> Check with source code of powertop
> while (edx) {
> if (edx&7)
> printf("C%i ", i);
> edx = edx >> 4;
> i++;
> }
> Only simple check value of edx.
> Well, unless CPU uses CPUID.5.EDX[31:20], the reserved area.
>
> Ps: I does not check AMD's spec.
>
> Best Regards,
> Edward
>
>
> On Sat, Jun 20, 2009 at 1:07 AM, Mahmood Naderan<mahmood.nt@xxxxxxxxx> wrote:
> > Hi,
> > I have run powertop with root permission with both AC and batter powers. The
> > reported C_States are the same and strange:
> >
> > mahmood@magma:~$ sudo powertop
> > PowerTOP 1.11 (C) 2007, 2008 Intel Corporation
> >
> > Collecting data for 5 seconds
> >
> > Your CPU supports the following C-states : C1 C2 C3 C4 C5 C6
> > Your BIOS reports the following C-states : C1 C2 C6
> >
> > Where are C4 and C5?
> >
> > --------------------------
> > *Mahmood Naderan*
> > --
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> >
>
>
>
> --
> Best Regards,
> Edward
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