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Date: Wed, 1 Feb 2012 14:55:44 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
        Milton Miller <miltonm@bga.com>, arjanvandeven@gmail.com,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: smp: Start up non-boot CPUs asynchronously
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On Tue, 31 Jan 2012 08:24:39 -0800
Arjan van de Ven <arjan@infradead.org> wrote:

> The starting of the "not first" CPUs actually takes a lot of boot time
> of the kernel... upto "minutes" on some of the bigger SGI boxes.

Where is all this time being spent?