Date: Mon, 14 May 2007 16:46:52 -0400
From: Dave Jones <davej@redhat.com>
To: Rob Landley <rob@landley.net>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: tracking down disk spinups.
Message-ID: <20070514204651.GA7242@redhat.com>
Mail-Followup-To: Dave Jones <davej@redhat.com>,
	Rob Landley <rob@landley.net>,
	Linux Kernel <linux-kernel@vger.kernel.org>
References: <20070514185734.GM27604@redhat.com> <200705141628.35617.rob@landley.net>
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On Mon, May 14, 2007 at 04:28:35PM -0400, Rob Landley wrote:
 > On Monday 14 May 2007 2:57 pm, Dave Jones wrote:
 > > Why did the kernel ignore what I told it to do ?
 > > I'm sure it thinks it knows better than me for a reason, but
 > > I'd like to know what it is.
 > 
 > Remount doesn't switch filesystem drivers, it tells the existing filesystem 
 > driver to accept new flags and/or a new option string.

yes, I had misinterpreted what 'remount' did. I thought behind the scenes
it actually did a umount/mount.

 > To switch drivers you have to umount the old sucker and mount the new one.  
 > (The idea of handing off consistent cache data from one mounted filesystem 
 > driver to another...  Ouch.)

a umount would purge the cache, but that's irrelevant given it doesn't
work that way.

Anyways, I rebooted after s/ext3/ext2/ on my fstab, and found things
hadn't really got any more obvious what was going on.
Instead of 'kjournald' writing stuff out, now it's 'pdflush'.

*has sudden brainwave*

Ahh, it's doing atime updates. Duh.

	Dave

-- 
http://www.codemonkey.org.uk
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