linux-kernel - Re: [patch 11/19] i386: Rework local APIC calibration

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Date:	Fri, 10 Nov 2006 12:10:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	John Stultz <johnstul@...ibm.com>, Andi Kleen <ak@...e.de>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch 11/19] i386: Rework local APIC calibration


* Arjan van de Ven <arjan@...radead.org> wrote:

> On Thu, 2006-11-09 at 23:38 +0000, Thomas Gleixner wrote:
> > plain text document attachment (i386-lapic-calibrate-timer.patch)
> > From: Thomas Gleixner <tglx@...utronix.de>
> 
> One question: why do the irq measurement at all if pmtimer is 
> available?

the pmtimer read will always return zero on platforms where there's no 
pm-timer clock - in this case the irq measurement is what calibrates.

	Ingo
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