Messages in this thread |  | | | Date | Thu, 26 Mar 2009 13:07:14 -0400 | | From | Theodore Tso <> | | Subject | Re: ext3 IO latency measurements (was: Linux 2.6.29) |
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On Thu, Mar 26, 2009 at 09:20:14AM -0700, Linus Torvalds wrote: > > > On Thu, 26 Mar 2009, Theodore Tso wrote: > > > > Most distributions are putting relatime into /etc/fstab by > > default, but we haven't changed the mount option. > > I don't think this is true. Fedora certainly does not. Not in F10, not in > F11.
Ubuntu does. I thought Fedora had, but I stand corrected.
> 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.
You can, actually, but it requires hacking /boot/grub/menu.list. The boot command option "rootflags=noatime" should do it, if their initrd scripts are at all sane (and they honor rootfstype, so they probably do also honor rootflags).
The question is whether we can make Fedora 11 and OpenSUSE do the right thing now that this has become a highly visible discussion. I'm actually fairly optimistic on this front. (Maybe some distro folks will care to chime in on whether upcoming releases of F11 and OpenSuSE can be changed to DTRT?)
Actually, given where F11 is on its release schedule, I suspect it would be *easier* for them to make a change to default boot options in grub's menu.conf than it would be backport a kernel patch, since they will be releasing their beta release within the week, and their final development freeze is in less than two weeks.
- Ted
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