linux-kernel - Re: [patch] clockevents: drivers for i386, fix #2

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Message-Id: <20061004011544.d49308de.akpm@osdl.org>
Date:	Wed, 4 Oct 2006 01:15:44 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, Jim Gettys <jg@...top.org>,
	John Stultz <johnstul@...ibm.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [patch] clockevents: drivers for i386, fix #2

On Wed, 4 Oct 2006 09:55:40 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Andrew Morton <akpm@...l.org> wrote:
> 
> > None of the interrupts are doing anything wrong.  oprofile shows 
> > nothing alarming.
> > 
> > Disabling cpufreq in config doesn't fix it.
> > 
> > Userspace can count to a billion in 3.9 seconds when this problem is 
> > present, which is the same time as it takes on a non-slow kernel.
> > 
> > `sleep 5' takes 5 seconds.
> > 
> > Yet initscripts take a long time (especially applying the ipfilter 
> > firewall rues for some reason), and `startx' takes a long time, etc.  
> > This kernel takes 112 seconds to boot to a login prompt - other 
> > kernels take 56 seconds (interesting ratio..)
> 
> hm, do you have the NMI watchdog enabled by any chance? [in particular, 
> do you have nmi_watchdog=2?] Although your bootlog does not show it.
> 

There's no nmi_watchdog setting in the kernel boot command line and the
NMI counter isn't incrementing.
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