linux-kernel - Influence of optimization level, preemption and scheduler on boot time

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Date:	Mon, 21 Sep 2009 23:25:53 +1200
From:	Johannes Buchner <buchner.johannes@....at>
To:	linux-kernel@...r.kernel.org
Subject: Influence of optimization level, preemption and scheduler on boot
 time

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.

Cheers,
Johannes

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