linux-kernel - Re: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ, CONFIG_HIGH_RES

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Date:	Tue, 01 May 2007 17:24:21 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Mark Lord <lkml@....ca>
Cc:	Daniel Walker <dwalker@...sta.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [BUG] 2.6.21: Kernel won't boot with either/both of
	CONFIG_NO_HZ, CONFIG_HIGH_RES_TIMERS

On Tue, 2007-05-01 at 10:13 -0400, Mark Lord wrote:
> Thomas Gleixner wrote:
> > On Tue, 2007-05-01 at 09:34 -0400, Mark Lord wrote:
> >>> now at 3232363876949 nsecs
> >> ...
> >>
> >> Oh, in case it matters any:
> >> that /proc/timer_list is from the system with CFS-V7 also patched in.
> > 
> > It should not. What happens when you disable HPET ?
> 
> Booting with clocksource=tsc still hangs in what appears
> to be the exact same place.

I meant disable HPET via: hpet=disable on the commandline 

> Screenshots for that are available here:   http://rtr.ca/hrtimers/
> 
> Of possible interest is that the bottom of the 25line screen capture
> differs somewhat from the 50line capture.. see for yourself.
> This is 100% consistent from boot to boot.
> 
> Using CONFIG_DETECT_SOFTLOCKUP=y eliminates the problem,
> so that's really got to be a huge clue, somehow ?

Unfortunately not. Other than it runs the watchdog task once a second it
does not affect the time/clockevent... mechanisms at all

	tglx


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