Messages in this thread | | | Date | Mon, 21 Sep 2009 13:20:59 +0200 | From | Arjan van de Ven <> | Subject | Re: Influence of optimization level, preemption and scheduler on boot time |
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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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