[Testing] Final review for Power Management Requirements, Trial-2

[Jim Gettys]

Brain fried.

Current mesh should last about 20 hours (once we get dcon turned off in
suspend).

Sorry,
                - Jim


On Thu, 2007-07-19 at 12:51 -0400, Jim Gettys wrote:
> Not even overnight....  10 hours, roughly.
> 
> Power overhead puts the consumption up to nearly a watt.  the 750-800mw
> number is *after* power conversion.
>                               - Jim
> 
> 
> On Thu, 2007-07-19 at 12:38 -0400, Michail Bletsas wrote:
> > Tilt!
> > 
> > Even at 750mW the mesh lasts for a long time...
> > 
> > M
> > -----Original Message-----
> > From: "Jim Gettys"  <jg at laptop.org>
> > 
> > Date: Thu, 19 Jul 2007 16:14:34
> > To:"Kim Quirk"  <kim at laptop.org>
> > Cc:"Marcelo Tosatti"  <marcelo at kvack.org>, "Dan Williams"
> > <dcbw at redhat.com>, "Chris Ball"  <cjb at laptop.org>, "Richard Smith"
> > <smithbone at gmail.com>, hughsient at gmail.com, "Andres Salomon"
> > <dilinger at laptop.org>, testing at laptop.org, "Michail Bletsas"
> > <mbletsas at laptop.org>
> > Subject: Re: Final review for Power Management Requirements, Trial-2
> > 
> > 
> > On Thu, 2007-07-19 at 10:50 -0400, Kim Quirk wrote:
> > > Jim and others,
> > > I added your explanation to the Requirements since it isn't obvious to
> > > all the people who might read the requirements as to why the suspend
> > > button is a good thing:  http://wiki.laptop.org/go/Requirements
> > >
> > > By the way -- since we have the suspend button now, maybe closing the
> > > lid should turn wireless off as well. On the rare case where the
> > > laptop is being used as a mesh relay, the student probably has to know
> > > that and has been instructed to leave his laptop open with antennas
> > > adjusted and hit the suspend button.  That would save a lot of
> > > power!!
> > >
> > 
> > If we can't get the power consumption down on wireless mesh, we'll need
> > to do this for sure.  It's a good suggestion, in any case.
> > - Jim
> > 
> > 
> > > Walter,
> > > Adding Walter to this email -- can you please review the Power
> > > Management Requirements at this link. The other topics on the
> > > Requirements page haven't had much discussion yet, but feel free to
> > > comment on those as well.
> > >
> > >
> > > Thanks,
> > > Kim
> > >
> > >
> > >
> > > On 7/19/07, Jim Gettys <jg at laptop.org> wrote:
> > >
> > >         The difference is the following:
> > >
> > >         If you've adjusted your antennae, closing the lid will destroy
> > >         the
> > >         adjustment, and take the antennae to the ground if the laptop
> > >         is on the
> > >         ground.
> > >
> > >         Since we want the mesh up, this is *bad*.  Really bad....  So
> > >         closing
> > >         the lid isn't good behavior to encourage.
> > >
> > >         Explaining to a 7 year old under what circumstances an idle
> > >         governor
> > >         (which we don't have yet) will suspend the machine (or not) is
> > >         way to
> > >         complicated: what is more, only the kid knows if (s)he's
> > >         really done
> > >         with what they were doing.
> > >
> > >         So the point of the button press is an explicit way to force a
> > >         suspend,
> > >         preserve the mesh, and have something we can explain.
> > >
> > >         The fact that it doesn't turn off +
> > 
-- 
Jim Gettys
One Laptop Per Child