Re: [OLPC-AU] XO-1.75 relative performance
I'm not aware of any comprehensive performance assessments. Have you got an XO-1.75 yet? Performance is a design goal of OLPC, but it isn't first in the list. The full list is: 1. Safe -- no children should be harmed 2. Stylish and Usable -- something children want to own 3. Lowest Power -- low power means longer run-time 4. Lowest Cost -- a lower cost means more children can have one 5. Robust and Maintainable -- children drop things 6. Performance (speed) If we find we are sacrificing, say, Lowest Power for Performance reasons, we would be obliged to think again. -- James Cameron http://quozl.linux.org.au/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [OLPC-AU] XO-1.75 relative performance
On 11/01/2011 08:54 PM, C. Scott Ananian wrote: the online benchmarks will probably be Android-based, and won't tell you anything about battery life and power consumption, where OLPC has put its focus and made great improvements.) I suppose Its probably time to start throwing out some worst case battery life numbers. We have built enough revs of the 1.75 now that the works case numbers aren't going to change. My battery logs show that the minimum useful Wh we get out of our battery is 18Wh. Fully loaded I've yet to see the XO-1.75 draw more than 5W [1]. So 18Wh/5W is 3.6h. I feel safe in saying that regardless of what you do on the 1.75 you are going to get 3.5 hours of battery life. Period. Thats a lot better than the worst case values of 1.5 which was difficult to pin down. Since suspend/resume is still undergoing heavy development I don't have any good estimates yet for user based workloads but early indicators look promising. In the coming weeks I'll get some good numbers. An interesting data point is that the 1.75 is the first laptop of the XO series that has ran 100% from a solar panel for an extended period. During my solar testing I often swap in different batteries. The 1.75 can consistently survive battery removal under moderate solar conditions when connected to the OLPC 10W solar panel. [1] Excluding connecting an external USB device drawing full power which would be an extra 5W. -- Richard A. Smith rich...@laptop.org One Laptop per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
