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Rockbox mail archiveSubject: Re: Update: Test - Rockbox running directly from flash rom (ROMbox)Re: Update: Test - Rockbox running directly from flash rom (ROMbox)
From: Jens Arnold <arnold-j_at_t-online.de>
Date: Mon, 26 Jul 2004 00:44:35 +0200 >> 2. What benefit will this have? I assume battery time, but it >> doesn't seem like a great saving to me. Has anyone performed >> any calculations that might determine the possible battery >> time increases? > Jens is currently measuring this. We have ~10% more buffer, so > the saving can only be in that order of magnitude. Not too > much, but if it comes for free... I completed my first set of runtime tests - 2 passes each for mp3 playback and video playback, both from ROM (Rombox) and from RAM (RoLo'd into .ajz compiled from the same .cvs tree). Of course, doing only 2 rounds and then comparing small differences is rather unreliable from a statistical point of view, but I can say with some certainty we can expect ~3..4% longer runtime when running from ROM with standard RAM (2 MB). For those who did the 8 MB mod it will be less... Some more details about my tests for those who are interested: Device: Archos Jukebox Recorder 20 (V1, USB2), upgraded to 80 GB (IBM (HGST) IC25N080ATMR04) Batteries: Stock Archos 1500 mAh NiMH Rockbox: CVS tree of 2004-07-21, .ajz and Rombox versions, only other modification being my "geeky" bitswap (shouldn't have noticeable impact on battery performance; saves some code space) Settings: (only settings that might have some influence on battery runtime while the test is running) Disk Poweroff: Yes Max files in dir browser: 300 Max playlist size: 5000 Caption backlight: No Scroll speed: 8 Hz Peak meter/Performance: High performance (there is a peak meter in my .wps) MP3 test: Collection of VBR mp3s (a whole album), average bitrate 227 kbps; played with Repeat: All ROM runtime: ~9:00 h RAM runtime: ~8:45 h Video test: 3:12 h of Movie converted to .rvf with mp3 audio track, total average bitrate 626 kbps; manually restarted at the end ROM runtime: ~4:50 h RAM runtime: ~4:40 h Regards, Jens _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-07-26 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |