RFC: powerd algorithms enhancements

[Nenhum_de_Nos]

answering two in a row ...

On Wed, November 12, 2008 1:41 am, Ian Smith wrote:
> On Tue, 11 Nov 2008, Alexandre "Sunny" Kovalenko wrote:
>  > On Tue, 2008-11-11 at 15:56 -0200, Nenhum_de_Nos wrote:
>  > > On Tue, November 11, 2008 3:20 am, Ian Smith wrote:
>  > > > On Mon, 10 Nov 2008, Nenhum_de_Nos wrote:
>  > > >  > as all you are talking about the subject, and I read all
> messages, is
>  > > >  > there any module to load and make my AthlonXP 1700+ use less
> power ?
>  > > >  >
>  > > >  > running 7-STABLE, just a file server. any acpi-stuff I could
> enable
>  > > > would
>  > > >  > be great, as I just use all its power when compiling ...
>  > > >
>  > > > What does 'sysctl hw.acpi dev.cpu' have to say?
>  > >
>  > [...]
>
> Reinjecting a bit ..
>
>  > hw.acpi.thermal.user_override: 0
>  > hw.acpi.thermal.tz0.temperature: 43.0C
>  > hw.acpi.thermal.tz0.active: -1
>  > hw.acpi.thermal.tz0.passive_cooling: 1
>  > hw.acpi.thermal.tz0.thermal_flags: 0
>  > hw.acpi.thermal.tz0._PSV: 66.0C
>  > hw.acpi.thermal.tz0._HOT: -1
>  > hw.acpi.thermal.tz0._CRT: 70.0C
>  > hw.acpi.thermal.tz0._ACx: 66.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
>  > hw.acpi.thermal.tz0._TC1: 4
>  > hw.acpi.thermal.tz0._TC2: 3
>  > hw.acpi.thermal.tz0._TSP: 60
>  > hw.acpi.cpu.cx_lowest: C1
>
> Certainly no cpu frequency control.  Surprisingly low _CRT temperature
> but unless it ever actually gets too hot, it's not a problem.  I don't
> really follow why .passive-cooling=1 with no cpufreq driver/s attached?

I have no idea also ... the cooling is indeed active ...

>  > > [root at xxx ~]# sysctl dev.cpu
>  > > dev.cpu.0.%desc: ACPI CPU
>  > > dev.cpu.0.%driver: cpu
>  > > dev.cpu.0.%location: handle=\_PR_.CPU0
>  > > dev.cpu.0.%pnpinfo: _HID=none _UID=0
>  > > dev.cpu.0.%parent: acpi0
>  > > dev.cpu.0.cx_supported: C1/0 C2/90 C3/900
>  > > dev.cpu.0.cx_lowest: C1
>  > > dev.cpu.0.cx_usage: 100.00% 0.00% 0.00%
>  > > [root at xxx ~]#
>  > >
>  > > if it rings any bells :)
>  > All I can suggest here is
>  >
>  > sysctl dev.cpu.0.cx_lowest="C3"

got the system unresponsive to the point of a hard reset needed ...

>  > or, if it gets you totally unresponsive machine,
>  >
>  > sysctl dev.cpu.0.cx_lowest="C2"

not much time in it, I must confess, bit didn't see any lowering in power
consumption, will try again ...

>  > how much of the power saving you will see from this is the
>  > separate question.
>
> If that works to any extent you'll notice some drop in cpu temperature.
> I do see a slight but noticeable idle temp. drop on my T23 in C2, though
> nothing compared to the power reduction of lower frequency (about half).

that was all I wanted, but as said that this cpu is older than yours, I
really don't think I'll get all that ...

> cheers, Ian

thanks to all,

matheus

-- 
We will call you cygnus,
The God of balance you shall be