linux-kernel - Re: smp: Start up non-boot CPUs asynchronously

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Message-Id: <20120201145544.f3a4cc64.akpm@linux-foundation.org>
Date:	Wed, 1 Feb 2012 14:55:44 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Milton Miller <miltonm@....com>, arjanvandeven@...il.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: smp: Start up non-boot CPUs asynchronously

On Tue, 31 Jan 2012 08:24:39 -0800
Arjan van de Ven <arjan@...radead.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?
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