Hi, I read an interesting thread about overclocking the n800 [1]. Based on that I started experimenting with the n800 running OS2008. The OS scales the cpu frequency nicely from 165MHz up to 400MHz.
The current cpu scaling can be checked with cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq So far so good. I noticed that during playback of mp3 files the cpu is scaled to 330MHz. Stressing the cpu during mp3 playback will not change the scaling - the cpu will not scale up to 400MHz. According to a presentation "Nokia Internet Tablet Power Managemen" [2] the dsp runs at 220MHz when the cpu is set to 330MHz. (This is the default setting in OS2007, by the way.) I was wondering if the device really needs to run at 300MHz (220MHz dsp) for mp3 playback? Is the max dsp power needed for such a task? Or would 220MHz (177MHz dsp) or 165MHz (85MHz dsp) be sufficient? Would a lower dsp scaling save even more battery? Has anyone managed to successfully change the settings manually? Best regards Krischan [1] http://internettablettalk.com/forums/showthread.php?t=10681&highlight=overclocking [2] http://maemo.org/news/announcements/view/1184097560.html Nokia Internet Tablet Power Management by Klaus K Pedersen, Igor Stoppa _______________________________________________ maemo-developers mailing list [email protected] https://lists.maemo.org/mailman/listinfo/maemo-developers
