Suspended time vs Resumed time in an idle XO

[Giannis Galanis]

in case you need it, i am resending the script because it was blocked

On Fri, Feb 22, 2008 at 2:55 PM, Giannis Galanis <galanis at laptop.org> wrote:

> I have noticed that an idle machine will resume for some time, and suspend
> again, several times for no reason.
>
> I wrote a simple script that checks every 1sec whether the machine is
> suspended on not.
> It gives a timeline of Suspended times and Resumed times.
>
>
> A left an XO completely idle overnight for 12h.
>
> The results were:
>
> It resumed about 80 times
> It was resuming every 1m to 10min
> The total suspended time percentage was 90%
>
> Do these numbers seem normal?
>
> Chris was mentioning the other day about the additional power consumed to
> resume the XO.
> I can assume that resuming/suspending at a regular basis is not very power
> efficient.
>
>
> Also, this script made it easy to examine what happens to timeouts that
> are interrupted with suspends.
>
> The result is that the suspended time extends the timeout. The timeout
> does not expire relative to the absolute time, but the time the CPU is
> alive.
> So if a 10min timeout is interrupted by a 2min suspend, the timeout will
> expire 12min after the point it was executed.
> Scott, does this agree with what you expected?
>
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