hi, Maybe.... as I asked where is the source code of powertop and what is the intel utility that you said in windows? Thanks. -------------------------- *Mahmood Naderan* On Sun, Jun 21, 2009 at 2:36 PM, Edward Shao<laface.tw@xxxxxxxxx> wrote: > Hi~ > In your case, typically C3 should map to CPU C6. > > Best Regards, > Edward > > On Sun, Jun 21, 2009 at 5:20 PM, Mahmood Naderan<mahmood.nt@xxxxxxxxx> wrote: >> I got more confused... In my first post if you see, BIOS reports C1, >> C2 and C6. Even it does not support C3 (!), but here is the output of >> "cat /proc/acpi/processor/CPU0/power": >> >> active state: C0 >> max_cstate: C8 >> bus master activity: 00000000 >> maximum allowed latency: 2000000000 usec >> states: >> C1: type[C1] promotion[--] demotion[--] >> latency[001] usage[00000063] duration[00000000000000000000] >> C2: type[C2] promotion[--] demotion[--] >> latency[001] usage[00017466] duration[00000000000014422985] >> C3: type[C3] promotion[--] demotion[--] >> latency[162] usage[00096196] duration[00000000000650582389] >> >> So I think something (BIOS or CPU or OS) is malfunctioning and does >> not report correctly. >> Now the big question is, will my system (a combination of CPU, BIOS >> and OS) enter C3 (or even deeper states)? >> >> -------------------------- >> *Mahmood Naderan* >> >> >> >> >> On Sun, Jun 21, 2009 at 2:34 AM, Ananth Narayan >> S<ananth.narayan@xxxxxxxxx> wrote: >>> You could see it that way. The OS will use the C states exported by >>> the BIOS. If C4/C5 are not exported, the OS will not even know that >>> such states exist. If you query /proc/acpi/CPU*/power, you'll probably >>> see just three C states listed (C1, C2, C3). Typically the last >>> C-state (C3) in that will map to the lowest C-state supported by the >>> processor. >>> >>> -- Ananth >>> >>> >>> >>> >>> On Sat, Jun 20, 2009 at 8:46 AM, Mahmood Naderan<mahmood.nt@xxxxxxxxx> wrote: >>>> Hi, >>>> So if my understanding is correct, the BIOS does not allow the CPU to >>>> enter C4 and C5 states. Right? >>>> >>>> -------------------------- >>>> *Mahmood Naderan* >>>> >>>> >>>> >>>> >>>> On Sat, Jun 20, 2009 at 7:56 PM, Ananth Narayan >>>> S<ananth.narayan@xxxxxxxxx> wrote: >>>>> Intel processors export a max supported c state value. But when it >>>>> comes to c states, typically the one that provides max power savings >>>>> is exported by the BIOS. The intermediate ones aren't. >>>>> >>>>> -- Ananth Narayan S. >>>>> >>>>> >>>>> >>>>> >>>>> On Fri, Jun 19, 2009 at 10:07 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* >>>>>> -- >>>>>> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in >>>>>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>>>>> >>>>> >>>> >>> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > > > -- > Best Regards, > Edward > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
