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Ipod Video 60GB: Poor battery life under rockbox (2 times less than expected)

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Llorean:
Compressed audio is always buffered with all the memory available. The anti-skip buffer is "how low do we let the compressed buffer get  before we begin refilling it." If you're not shaking the MP3 player for long durations, there's no reason not to have it the lowest possible setting. The higher you set it, the more often it refills the memory, because there's a large portion of the memory that is never allowed to empty.

penartur:
Thanks for your explanation!

However, after i've reduced anti-skip from 10 minutes to 30 seconds, battery life increased only to 2%, it is 14:30 now on the same playlist; nobody have touched the ipod for all this 13 hours, screen was off, backlight off and hold switch was set to on to prevent accidental buttons hitting.

Attached is new battery_bench.txt.
Will try it with default settings tomorrow.

I can do any diagnostics or tests you want, except for the ones that require disassembling the device again :)

Chronon:
Apple's battery estimates can fluctuate quite a lot and aren't necessarily very reliable at any given point in time.  So a better comparison would be to run it completely down while using Apple's firmware and then compare this to what you get in Rockbox. 

penartur:
With the default settings i've got the same 14:20 while playing mp3s.
Then, i've tried to build rockbox on a vmware build lab ( http://www.rockbox.org/twiki/bin/view/Main/VMwareDevelopmentPlatform ), i've used revision 20878 + patch from rmaniac for MK2431GAH support + FS#9746 + FS#9708 (v0.6, UDMA4) + FS#8668.
With ReplayGain on, cuesheet support on, Boofers theme, album art and 16Ohm earphones on -30dB i've got 22:23 of playback while playing FLAC (Metallica S&M, 496MB+480MB). That's more than two times more than i've got on flacs on v3.2. Hold was ON, and i've switched it to OFF for about 10 times.
So, either some changes since 3.2 or one of this three patches doubled my battery life.
I think that both my second benchmark (MP3 320kbps, anti-skip on 30 seconds and rockbox v3.2, http://forums.rockbox.org/index.php?action=dlattach;topic=21593.0;attach=3669 ) and current one should be posted on http://www.rockbox.org/twiki/bin/view/Main/IpodRuntime, so that users will be able to see the difference and understand why their battery time on 3.2 is so lower than on the wiki page and what they could do to improve it. However, i'm unable to edit wiki pages; so maybe someone here will do this for me? :)
I couldn't even hope on such battery runtime on lossless, and it is just amazing :)

PS: If you wish, i can do the same benchmark on MP3s within a couple of days :)

Llorean:
Why not track down which patch is the one that affects battery life?

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