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Date:      Sat, 3 May 2014 09:37:08 -0700
From:      Adrian Chadd <adrian@freebsd.org>
To:        Matthias Apitz <guru@unixarea.de>
Cc:        freebsd-advocacy@freebsd.org, "current@freebsd.org" <current@freebsd.org>, David Chisnall <theraven@freebsd.org>, Eitan Adler <lists@eitanadler.com>, "freebsd-hackers@freebsd.org" <hackers@freebsd.org>, Jordan Hubbard <jkh@mail.turbofuzz.com>
Subject:   Re: Leaving the Desktop Market
Message-ID:  <CAJ-VmokHQvb2S-1c08J3RECUMosQ%2Bcd1gdB91LAb5famfKqP5w@mail.gmail.com>
In-Reply-To: <20140503155745.GA2457@La-Habana>
References:  <CAF6rxgkeBozvfV-L0%2BrFZ6fWRn0=Gi3BNq1kPL=-HTq0TD6MkQ@mail.gmail.com> <A70900DF-4BAA-427F-8731-01211FFD1887@mail.turbofuzz.com> <3F7430D7-3C0F-43E1-8EBD-8AA4F701497C@FreeBSD.org> <20140503155745.GA2457@La-Habana>

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Hi,

I'm working on adding some more power management logging support to
freebsd-head so we can start to get a better grip on sleep/wakeup
occurances. That should help us start to figure out where the power
consumption is going.

But on that EEEPC 900, just make sure you've set dev.cpu.0.cx_lowest
to something lower than C1.


-a



On 3 May 2014 08:57, Matthias Apitz <guru@unixarea.de> wrote:
> El d=C3=ADa Tuesday, April 01, 2014 a las 08:38:28AM +0100, David Chisnal=
l escribi=C3=B3:
>
>>
>> Just a small note here: Improving power management is something that the=
 Core Team and the Foundation have jointly identified as an important goal,=
 in particular for mobile / embedded scenarios.  We're currently coordinati=
ng potential sponsors for the work and soliciting proposals from people int=
erested in doing the work.  If you know of anyone in either category then p=
lease drop either me, core, or the Foundation an email.
>>
>
> Hello,
>
> Using every day one of my FreeBSD netbooks (see below), I know very well
> that improving power management and by this the uptime while running on
> battery is a serious issue. I'm currently surprised about the big
> diff between two of my netbooks, one running 1 hour only while the other
> runs ~4 hours. I'm thinking about building a cable connection between
> the battery and the netbooks to measure the exact power drain (normally
> one can not see this because the battery is connected into its bay and
> you can not put any meter in there).
>
> I'm an experienced C-programmer and long time FreeBSD user and tester
> and I'm willing to dig deeper into this work. Please let me know if
> there is something to work on.
>
> Attached below is a description of the two mentioned netbooks and their
> uptime values.
>
> Thanks
>
>         matthias
>
>
>
> comparing battery life time of [EeePC 900] and [Acer Aspire One D250]
>
>
>           | EeePC 900                   | Acer Aspire One D250
> ----------+-----------------------------+--------------------------------=
----
> CPU       | 900 MHz Intel Celeron M 353 | 2x Intel Atom CPU N270 @ 1.60GH=
z
> RAM       | 2 GByte                     | 1 GByte
> disk      | 2x SSD (4 GB, 16 GB)        | WDC WD2500BEVT-22ZCT0 11.01A11
>           |                             | ATA-8 SATA 2.x, 238475MB
> display   | TFT 1024x600 9"             | TFT 1024x600 10"
> FreeBSD   | 10-CURRENT r255948          | 10-CURRENT r250588
> KDE       | 4.10.5                      | 3.5.10
> WAN (UMTS)| USB u3g Huawei E1750        | USB u3g Huawei E1750
> ----------+-----------------------------+--------------------------------=
----
> battery   | Li-ion A22-701 7.4V 7200mAh | Li-ion UM08B74 11.1V 5200mAh / =
54Wh
>           | 53.380Wh                    | 57.720Wh
> ----------+-----------------------------+--------------------------------=
----
> uptime    | ~1 hours                    | ~4 hours
> ----------+-----------------------------+--------------------------------=
----
>
>
> --
> Matthias Apitz               |  /"\   ASCII Ribbon Campaign:
> E-mail: guru@unixarea.de     |  \ /   - No HTML/RTF in E-mail
> WWW: http://www.unixarea.de/ |   X    - No proprietary attachments
> phone: +49-170-4527211       |  / \   - Respect for open standards
>                              | en.wikipedia.org/wiki/ASCII_Ribbon_Campaig=
n
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