Originally Posted by slender

I just noticed same thing about powertop and tried to search that thread what you are talking about and right now my "**** this" meter hits quite high. I cant find it event with google.

Originally Posted by etuoyo

Doesn't make sense to me. The whole point of the N900 to me is to be always online. That is always reachable by IM and if I need to surf the net and not near a PC I can do so from my N900. If I have to decide when to be recheable and guess when my friends would be reachable then not sure why the device would be referred to as always online. More like don't stay always online.

Originally Posted by bugelrex

If you run IM app Fring on the Nokia E71, the battery can still last for 1-2 days. It can be done, I don't know if its extra optimization within Fring or special optimizations in the E71. The battery issue is not the larger screen of the n900 or CPU load as you can run comparison tests without screen at idle to prove it

Originally Posted by Makeclick

2g is so slow..(215/89KB). Someone have to make software witch can automat change connection speed? Hsdpa and Hsupa suck very much power! Even skype does't run with 2G..

Sorry about bad english..

Originally Posted by shadowjk

Nokia Energy Profiler exists for Maemo5, it has been spotted in screenshots. There was a mailing list thread asking when/if people outside Nokia would get access to it. The response seemed positive. That was in November and nothing seems to have happened since, atleast I couldn't find any info on it.

For idle time life, powertop is way more useful than top, as it is wakeups that matter more than total cpu use. If application A uses 5 seconds of CPU time in one go, and application B uses 5 seconds of CPU time spread out in tiny pieces every half second for 10 hours, then B will use a few magnitudes more battery power.

The same can be said for 3g. On S60, Nokia Energy Profiler can tell you how costly wakeups of the radio are. If I understand the display correctly, any data moving requires the radio to stay on full power for 5 seconds. So, if skype or SIP sends a keep-alive ping every 10 seconds, the radio is on half the time. At full power I'd expect it to last 4 hours, so in this scenario I'm guessing 8-10 hour battery life. This 5 seconds value is supposedly determined by the operator.

So if you have 4 things that behave this way, it's likely they aren't synchronized with eachother, and then on average wake up the radio every 2.5 seconds, effectively keeping it on all the time.

EDGE is nicer for apps like that... 3g bad for frequent small transfers, but nice for short and intensive bursts of data.

I vaguely remember seeing an API from Nokia for apps to coordinate network activity, essentially a way for apps to tell eachother "Hey, I'm going to wake up the radio, got any stuff you want to send?". Unfortunately I've been unable to find this API again, I don't even remember if it was for maemo or s60 or what..

Originally Posted by shadowjk

Nokia Energy Profiler exists for Maemo5, it has been spotted in screenshots. There was a mailing list thread asking when/if people outside Nokia would get access to it. The response seemed positive. That was in November and nothing seems to have happened since, atleast I couldn't find any info on it.