Subject: Re: The ext3 way of journalling
From: Bernd Petrovitsch <bernd@firmix.at>
To: Tuomo Valkonen <tuomov@iki.fi>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20080114111158.GB29126@jolt.modeemi.cs.tut.fi>
References: <20080110131659.GF10230@mit.edu>
	 <20080110134111.GA6254@jolt.modeemi.cs.tut.fi>
	 <20080112150621.GC6751@mit.edu>
	 <20080113221301.GA18341@jolt.modeemi.cs.tut.fi>
	 <20080113222310.GA20815@jolt.modeemi.cs.tut.fi>
	 <20080113231150.GB23906@mit.edu>
	 <20080114071555.GA6475@jolt.modeemi.cs.tut.fi>
	 <1200303743.24517.6.camel@tara.firmix.at>
	 <slrnfombug.lco.tuomov@jolt.modeemi.cs.tut.fi>
	 <1200304629.24517.15.camel@tara.firmix.at>
	 <20080114111158.GB29126@jolt.modeemi.cs.tut.fi>
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Organization: Firmix Software GmbH
Date: Mon, 14 Jan 2008 12:18:06 +0100
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On Mon, 2008-01-14 at 13:11 +0200, Tuomo Valkonen wrote:
> On 2008-01-14 10:57 +0100, Bernd Petrovitsch wrote:
> > That leads to the question why the clock starts to run like crazy at
> > some time so that `ntpd` can't cope with it.
> 
> I do wonder whether the PSU could've been causing it. Now that think

We have some embedded systems where some strange problems[0] were caused
by bad/cheap/low-quality PSUs.

> about it, I got the PSU around two years ago, just like I compiled 
> 2.6.14. This PSU coincidentally seems to have been the cause of the 
> crash that started this thread, and went completely silent during 
> the same day, on the third crash. But even if the PSU could cause
> the timer interrupt to signal too frequently or so, doesn't explain
> why nearly always after a crash (when journal recovery would be the
> normal course of action), fsck starts checking with absurd intervals
> since last check, whereas there's no trouble booting after normal
> shutdown.

But for normal PCs, I don't know how much the quality of a PSU is
relevant for the speed of the clock.
Can you test with a different PSU?

	Bernd

[0]: I don't know more details out of the top of my head.
-- 
Firmix Software GmbH                   http://www.firmix.at/
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          Embedded Linux Development and Services


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