Re: Leaving the Desktop Market

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_at_unixarea.de> wrote:
> El día Tuesday, April 01, 2014 a las 08:38:28AM +0100, David Chisnall escribió:
>
>>
>> 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 coordinating potential sponsors for the work and soliciting proposals from people interested in doing the work.  If you know of anyone in either category then please 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 _at_ 1.60GHz
> 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
> ----------+-----------------------------+------------------------------------
>
>
> --
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