Re: [Cooker] Dramatic poor performance for XFS delete (worse since 2008.1)

[Olivier LAHAYE]

For sure it wasn't the correct link ;-)

http://everything2.com/index.pl?node_id=1479435

This one should be better ;-)

Le Monday 28 April 2008 17:26:19 Stéphane Téletchéa, vous avez écrit :
> Selon Olivier LAHAYE <Olivier.Lahaye@motorola.com>:
> > Recetly, I've discovered that XFS delete performance have been worse than
> > ever.
> > Doing the test below on ext3 and on xfs (same partition, same computer
> > (after a mkfs) shows that ext3 is using buffers (disk blinks from times
> > to  times) while xfs seems to write the disk on the fly (disk always
> > lit).
> >
> > Question: are you aware of a patch in kernel that (for any reason)
> > disabled the use of buffers in XFS?
> >
> > time ( for i in $(seq 1 10000); do echo $i | md5sum> xxx_$i; done; sync
> > ); time ( /bin/rm -f xxx_*; sync )
> >
> > Note that we studied disk parameters and set the same in both tests
> > (hdparm -c3 -d1 -u1)
> > and I mountex xfs filesystem using -ologbufs=8
> >
> > With absolutely no differences.
> >
> > Following the tweaking guide below did not change any results (while some
> > improvements were expected)
>
> http://www.generation-nt.com/licence-3g-rejet-candidature-free-mobile-arcep
>-actualite-46044.html
>
>
> Probably not the good link :-)

-- 
	Olivier LAHAYE
	Motorola Labs IT Manager
	Computer & Information Systems
	European Communications Research