Re: XFS drops create/delete files to 6.6% of EXT3 (software raid) and to 0.6% of EXT3 (3ware hardware raid)

[David Chinner <dgc@sgi.com>]

On Wed, Apr 23, 2008 at 11:01:51PM -0500, Eric Sandeen wrote:
> Michael Darling wrote:
> > I am preparing a new server, and benchmarking EXT3 against XFS, both using
> > software RAID and hardware RAID using a 3ware 9650SE-4LPML.
> > 
> > Using bonnie++ as a benchmark, I am seeing significant performance boosts in
> > my block sequential reads and writes moving from EXT3 to XFS.  I am aware
> > that XFS won't create and delete files as quickly as EXT3, however I am
> > seeing drops from 29455/second to 1957/second using software RAID, and from
> > 32524/second to 189/second using hardware RAID.  I'm not sure if when using
> > software raid, if creating and deleting files should drop to 6.6% of EXT3.
> > But, what I'm pretty sure of, is when using hardware raid, that creating and
> > deleting files shouldn't drop to 0.6% of EXT3.
> 
> So I played with this a little on 2.6.25, on plain partitions.
> 
> I saw similar numbers; for example, sequential creates:
> 
> ext3:		23698/s
> xfs:		  319/s
> xfs,nobarrier:	 4478/s

And with logbsize=256k?

Cheers,

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