Re: tuning XFS for tiny files

[David Chinner <dgc@sgi.com>]

On Thu, Jul 19, 2007 at 03:38:43PM +0200, Andi Kleen wrote:
> timotheus <timotheus@tstotts.net> writes:
> 
> > Hi. Is there a way to tune XFS filesystem parameters to better address
> > the usage pattern of 10000s of tiny files in directories such as:
> >     maildir directory
> >     mh mail directory
> >     ccache directory
> > 
> > My understanding is that XFS will always be much slower than reiserfs
> > with respect to deleting 10000s files; but that XFS might be possible to
> > tune toward more rapid read access of 10000s of tiny files.
> 
> -d agcount=1 at mkfs time might help (unless you have a lot of CPUs) 

Yeah, might help, but it's not good for being able to repair the
filesystem - repair will be unable to find a secondary superblock
to compare the primary against and abort.....

-d agcount is only good for science experiments, not production
systems ;)

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group