Message-ID: <46374B1D.6050509@rtr.ca>
Date: Tue, 01 May 2007 10:13:49 -0400
From: Mark Lord <lkml@rtr.ca>
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To: tglx@linutronix.de
Cc: Daniel Walker <dwalker@mvista.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@osdl.org>
Subject: Re: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ,
 CONFIG_HIGH_RES_TIMERS
References: <46364EBC.5050804@rtr.ca> <46364F5A.2030208@rtr.ca>	 <463653A3.5040606@rtr.ca>  <46367D7E.6060502@rtr.ca>	 <1177976798.12796.286.camel@imap.mvista.com>  <463683A6.4010505@rtr.ca>	 <1178026458.5791.305.camel@localhost.localdomain> <4637419D.8010303@rtr.ca>	 <463741F1.7050706@rtr.ca> <1178027285.5791.307.camel@localhost.localdomain>
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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.

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 ?

Meanwhile, I'm going to try a libata patch I just saw posted by Tejun.
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