linux-kernel - Re: [PATCH] x86-64: Disable local APIC timer use on AMD systems with C1E

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Message-Id: <200709252332.41710.rjw@sisk.pl>
Date:	Tue, 25 Sep 2007 23:32:40 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>, Andi Kleen <ak@...e.de>,
	Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Len Brown <lenb@...nel.org>,
	"Langsdorf, Mark" <mark.langsdorf@....com>
Subject: Re: [PATCH] x86-64: Disable local APIC timer use on AMD systems with C1E

On Tuesday, 25 September 2007 22:55, Thomas Gleixner wrote:
> On Tue, 2007-09-25 at 22:55 +0200, Rafael J. Wysocki wrote:
> > I have reworked the patch a bit so that it applies on top of 2.6.23-rc8-mm1
> > and compiles (my version is attached).
> > 
> > With this patch applied, the kernel boots correctly on the nx6325.
> 
> I know. It's basically enforced "noapictimer". 
> 
> But this still does not explain why your nasty box booted current
> mainline with "apicmaintimer" on the kernel command line.

Now it doesn't do that any more.

As I wrote in the other thread, I think that _sometimes_ the CPU doesn't enter
the C1E state (or how it's called) and then the box boots and works.

Greetings,
Rafael
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