Messages in this thread | | | From | Gene Heskett <> | Subject | Re: Linux 2.6.29 | Date | Fri, 27 Mar 2009 15:19:10 -0400 |
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On Friday 27 March 2009, Theodore Tso wrote: >On Fri, Mar 27, 2009 at 11:05:58AM -0700, Linus Torvalds wrote: >> Alan. Repeat after me: "fsync()+close() is basically useless for any app >> that expects user interaction under load". >> >> That's a FACT, not an opinion. > >This is a fact for ext3 with data=ordered mode. Which is the default >and dominant filesystem today, yes. But it's not true for most other >filesystems. Hopefully at some point we will migrate people off of >ext3 to something better. Ext4 is available today, and is much better >at this than ext4. In the long run, btrfs will be better yet. The >issue then is how do we transition people away from making assumptions >that were essentially only true for ext3's data=ordered mode. Ext4, >btrfs, XFS, all will have the property that if you fsync() a small >file, it will be fast, and it won't inflict major delays for other >programs running on the same system. > >You've said for a long that that ext3 is really bad in that it >inflicts this --- I agree with you. People should use other >filesystems which are better. This includes ext4, which is completely >format compatible with ext3. They don't even have to switch on >extents support to get better behaviour. Just mounting an ext3 >filesystem with ext4 will result in better behaviour.
Ohkay. But in a 'make xconfig' of 2.6.28.9, how much of ext4 can be turned on without rendering the old ext3 fstab defaults incompatible should I be forced to boot a kernel with no ext4 support?
-- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Never look a gift horse in the mouth. -- Saint Jerome
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