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From: Frans Pop <elendil@planet.nl>
To: Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29)
Date: Thu, 26 Mar 2009 18:29:30 +0100
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References: <20090325150041.GM32307@mit.edu> <alpine.LFD.2.00.0903251008120.3032@localhost.localdomain> <20090325185824.GO32307@mit.edu> <alpine.LFD.2.00.0903251341050.3032@localhost.localdomain> <20090325215137.GQ32307@mit.edu> <alpine.LFD.2.00.0903251613300.3032@localhost.localdomain> <20090325235041.GA11024@duck.suse.cz> <20090326090630.GA9369@elte.hu> <20090326113705.GV32307@mit.edu> <20090326140312.GB14822@elte.hu> <20090326144707.GA6239@mit.edu> <20090326144707.GA6239@mit.edu> <alpine.LFD.2.00.0903260914440.3032@localhost.localdomain>
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Linus Torvalds wrote:
> And quite frankly, even if you then _manually_ put 'relatime' in
> /etc/fstab, the default Fedora install will totally ignore it. Why?
> Because it mounts the root partition while using initrd, and totally
> ignores /etc/fstab.

That's a difference between Fedora's initrd and Debian/Ubuntu's 
initramfs-tools then. We do respect the mount options in fstab for the 
root partition when root is mounted from the initrd:

$ cat /etc/fstab | grep " / "
/dev/mapper/main-root /      ext3    relatime,errors=remount-ro 0       1

$ mount | grep " / "
/dev/mapper/main-root on / type ext3 (rw,relatime,errors=remount-ro)

$ cat /proc/cmdline
root=/dev/mapper/main-root ro vga=791 quiet

Cheers,
FJP