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SubjectRe: Influence of optimization level, preemption and scheduler on boot time
On Mon, 21 Sep 2009 23:25:53 +1200
Johannes Buchner <buchner.johannes@gmx.at> wrote:

> Hi all.
>
> I measured the kernel (and system) boot times while varying the
> parameters:
> - Optimization level: -Os, -O2 and also -O3
> - Preemptive model
> - Scheduler: CFQ, Anticipatory, Deadline, Noop
>
> My conclusion was that the optimization level and the preemptive model
> had no significant influence on speed. CFQ let my system boot several
> seconds faster than the other schedulers.
>
> Graphs can be found at:
> http://johannes.jakeapp.com/blog/?p=913
>
> This conclusion may not be true for all situations, but I found it
> interesting that the optimization level is so irrelevant.
>

it's interesting to see that the IO scheduler mattered..
I would think that (s)readahead makes the IO scheduler irrelevant for
boot time...

--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org


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