Robin Burchell wrote:
On Sun, Jun 6, 2010 at 2:23 PM, Ian Stirling <maemo-de...@mauve.plus.com> wrote:
It's pretty hard to find out what's eating the battery on N900. First you
have decide that the battery is being consumed too fast. The default charge
meter occasionally realizes it's very wrong, and rapidly readjusts itself,
giving potential misreadings there. bq27200 certainly helps there, though
there's no "production quality" software available to use it yet. Nokia
Energy Profiler still shines with its absence ;)
I'm trying to develop something like this.
An energy profiler.
The ideal would be 'top' - sorted by power use.
But this is hard. :)
You mean, like, powertop? http://en.wikipedia.org/wiki/PowerTOP
No, fairly unlike powertop.
Powertop sorts by wakeups, which is not useless.
Consider a compute intensive task that uses 99.95% of the CPU.
At the same time, you've got a lightweight task that polls some
descriptor 10 times a second.
This will appear above the application that's really causing most
battery drain.
Powertops metric - wakeups per second - is arguably for some loads
better than top, but it can be horribly misleading for a number of reasons.
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