Auckland Testing Summary 23 March 2013

[Jerry Vonau]

On Mon, 2013-03-25 at 22:19 -0400, Richard A. Smith wrote:
> On 03/25/2013 02:03 PM, Richard Smith wrote:
> >>> Battery life on XO-4 C2 seems significantly improved over previous builds.
> >>> We would be interested in a confirmation or otherwise of this in the power
> >>> log analysis.
> >>
> >> I guess you are comparing to 13.1.0 build 36?
> >> The big difference here is that 13.1.0 build 36 has automatic power
> >> management disabled, it is now enabled in 13.2.0 (not 100% stable just
> >> yet, but we continue to shake out the bugs).
> >
> > Its probably the firmware change rather than a build specific change.
> > We turned off unused cores and in q7b23 and that made almost 800mW
> > worth of difference across the board in operational power draw.  I'll
> > do a plot of your power logs though and confirm.
> 
> It appears there is considerable difference between your previous tests 
> and now.  Last round of logs I have from you prior to this one was March 
> 2nd and prior to that was November 15, 2012 is that correct or did I 
> miss a batch between November and March?
> 
> Here's a ploy of XO-4 only 13.1.0-32 vs 13.2.0-1 all your other XO-4 
> 13.1.0 builds I have were very early and not really interesting from a 
> power standpoint.
> 
> http://dev.laptop.org/~rsmith/auckland_13.1_vs_13.2.png
> 
> Your peak decreased which I believe is from your firmware upgrade but 
> does not explain the whole story.  A closer look at your log file shows 
> a much, much higher suspend frequency in 13.2.  In your 13.1 tests you 
> had perhaps 1 or 2 suspends whereas in the 13.2 log files almost every 
> other line is a suspend event.
> 
> You didn't change your testing procedure did you?  Something that would 
> allow for more idleness?
> 

I was seeing high cpu usage that was present preventing suspend with
earlier builds. 

Jerry