[Community-news] OLPC News (2008-02-09)

[Jameson "Chema" Quinn]

re: turn off the network when not contributing

I second this idea, if it can be implemented.

Separate from suspended battery life, there is sleep life (I have to say I
still think these words are backwards. Suspend = automatic, screen on,
sleep= power button or close case, screen off; right?). One of my very
biggest gripes with the laptop as a whole is that the battery inevitably
runs down unless you turn it all the way off (which no kid will do). I
understand the concept of participating in mesh, but this should only happen
when there are 1-6 visible neighbors and actual traffic (waking it up for
one minute an hour to check? On the hour, so they all wake up together?).
Also, no matter what the mesh situation, a sleeping laptop should shut down
the network when it gets below some threshold - I'd guess about 10-15%
battery - and possibly even turn off completely to save the RAM power drain
too.

(if you really want to get fancy, the plenty-of-neighbors threshold should
be lower when the laptop is closed, since a closed laptop has a lower range
than the presumably ears-up laptops in use, so it takes fewer ears-up hops
to saturate its little neighborhood. On the other hand, if you go offline
when nobody seems to be handing you any meaningful traffic, you lose
built-in redundancy, but this comes free.)



On Sun, Feb 10, 2008 at 11:53 AM, Frank Ch. Eigler <fche at redhat.com> wrote:

> "Walter Bender" <walter at laptop.org> writes:
>
> > [...]
> > Chris Ball provided Richard with some power readings from our newly
> > enhanced power tinderbox running a C2 (mass production) laptop. [...]
> > The top auto-suspend power-draw breakdown:
> >
> > WLAN: 734 mW
> > backlight:    362 mW
> > memory:       239 mW
> > LCD:          218 mW
> > EC:           108 mW
> > other:                339 mW
> > total:                2064 mW
> > [...]
> > A next step will be to see if the wireless power can be reduced during
> > suspend. [...]
>
> Has the following idea already come up?  How about just turning off
> the wlan entirely during suspend, if the machine has reason to believe
> that its contribution to mesh connectivity is negligible?
>
> - FChE
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