On 05/30/2012 03:34 AM, Yioryos Asprobounitis wrote:
If you want an idea of low-level performance, I can suggest
running LMBench.
Got the Debian lmbench_3.0-a7 source that compiles and runs fine w/o bitkeeper.
Run the hardware part of the tests on the XO-1.5 (os880) and xo-1.75 (os12-
correct kernel) with the same configuration.
What was striking was that the XO-1.75 used 25% of the battery for 1 run while
the XO-1.5 used 65% of the battery!
If you are going to do more of this then you really need a better tool
than just the battery SOC measurement. olpc-pwr-log can sample the
information on a periodic basis and then my processing scripts can run
through those logs and produce various reports.
All of my tools are in my olpc-pwrlogs repo
git://dev.laptop.org/users/rsmith/olpc-pwrlogs
Let me know if you are interested and want to know how to use the tools.
Most of the test had empty values but the informative ones (below) show that
the XO-1.5 is better in basic integer operations and memory bandwidth while the
XO-1.75 is better in float and double operations as well as in memory latency.
I'm not sure how much this means for real life usage :-/
I'm very suspect of this measurement. The 1.5 has a hardware floating
point unit and the 1.75 is still using soft-float. Its extremely
unlikely that the floating point performance on 1.75 is better than the 1.5.
--
Richard A. Smith <rich...@laptop.org>
One Laptop per Child
_______________________________________________
Devel mailing list
Devel@lists.laptop.org
http://lists.laptop.org/listinfo/devel
