DragonFly BSD
DragonFly bugs List (threaded) for 2005-02
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Re: Off-Topic Question

From: Joerg Sonnenberger <joerg@xxxxxxxxxxxxxxxxx>
Date: Wed, 16 Feb 2005 19:26:57 +0100
Mail-followup-to: bugs@crater.dragonflybsd.org

On Wed, Feb 16, 2005 at 01:03:38PM -0500, David Rhodus wrote:
> Soft updates and journaling are not the same thing.

I know and I didn't say that. But soft updates allow a non-journaled
filesystem to be implemented with much less things to worry about.
E.g. NetBSD has support for ext2 uses the soft update code.
Even in a journaled filesystem, the general concept can be used to
keep track of what has to be journaled and what not.

> I haven't done
> any testing yet but I don't think FFS would perform as a very good
> modern filesystem if we remove soft updates without changing the
> behaviour of the filesystem.

The performance of FFS without soft updates [read sync mounted] would
be abysmal for stuff like cvs update. I don't consider async mount
valid for anything but mfs. Linux user tend to disagree on that.


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