Re: [Ext2-devel] [patch 11/18] dirsync

[Andrew Morton]

Andrew Morton wrote:
> 
> "Peter J. Braam" wrote:
> >
> > Hi
> >
> > I think this patch is actually pretty important - could we please have
> > this, or something like this?
> >
> 
> Well `-o sync' will give the same result.  dirsync is just a speedup.
> 
> I should have mentioned: untarring a kernel tree with dirsync is 4x to
> 5x faster than `-o sync', but still tons slower (5x?) than default.

grr.  On ext2.  

On ext3, dirsync _is_ sync for journalled and ordered modes.  If you
run a commit, you sync the entire fs, end of story.  So dirsync on ext3
really only makes a difference in writeback mode.

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