[olpc-nz] power logging

[Richard A. Smith]

On 01/16/2011 12:44 AM, Tom Parker wrote:

> I miss-spoke, it's not os860, but au852-4. I think this build is based
> on "10.1.2" but I really don't know what that means. I got the build
> from http://download.laptop.org.au/XO/F11/10.1.2/10.1.2-au4/ It appears
> to have powerd 29.

No worries.  It means I have to manually add a the KERNAPI but not a big 
deal.  Looks like you will pick up version 32 on the next test cycle 
with the later os builds.

> We usually reflash on external power, but not always. Testing sessions
> last between 3 and 4 hours. We're trying to make a point of charging the
> laptops the night before, so we have a longer session for you.

I think your setup is fine then.  No need for the new powerlog step. 
Most of your should be a single file with a constant discharge.  Perhaps 
after I get a few sessions I'll want to tweak it but this seems like a 
fine place to start.

> I believe the schoolserver and the laptop share some trust, but I don't
> know exactly how much. I know the laptop does a daily journal backup to
> the XS, it would be possible to include the power information in that
> process. I'm not sure if the schoolserver can request arbitrary files
> from the XO which would be ideal for this purpose (run a script on the
> XS to steal the power logs off all the laptops) but dangerous in many
> other respects which is why I doubt it can be done like that.

Yeah.  Its tricky.

-- 
Richard A. Smith  <richard at laptop.org>
One Laptop per Child