linux-kernel - Re: NMI watchdog

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Message-ID: <Pine.LNX.4.58.0710121210210.12663@gandalf.stny.rr.com>
Date:	Fri, 12 Oct 2007 12:12:44 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	John Sigler <linux.kernel@...e.fr>
cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: NMI watchdog


--
On Fri, 12 Oct 2007, John Sigler wrote:
> Steven Rostedt wrote:
>
> > John Sigler wrote:
>  > APIC timer registered as dummy, due to nmi_watchdog=1!
> 213a216,217
>  > Clockevents: could not switch to one-shot mode: lapic is not functional.
>  > Could not switch to high resolution mode on CPU 0
>
> Do you know why nmi_watchdog=1 disables high-resolution timers?
>
> And why nmi_watchdog=1 implies APIC timer registered as dummy?

Crap, I forgot about that. Thomas explained why to me once, and I forgot.

Does it still crash? If not, does it crash if you turn off highres?

Or better yet, try turning off dynamic-ticks. We had a bug once before
that had a problem with the new RCU code and dynamic ticks.

-- Steve
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