observed significant performance improvement using "delaylog" in

[Dave Chinner]

On Fri, Aug 13, 2010 at 08:29:07AM -0400, Christoph Hellwig wrote:
> On Fri, Aug 13, 2010 at 12:35:44PM +0200, Michael Monnerie wrote:
> > On Freitag, 13. August 2010 Stan Hoeppner wrote:
> > > Some benchmark results maybe worth a look:
> > > http://btrfs.boxacle.net/repository/raid/2.6.35-rc5/2.6.35-rc5/
> >  
> > Thanks - it would have been great to see xfs with delaylog in that 
> > comparison, but the graphs are very very nice.
> > 
> > XFS seems performing better the more threads there are, just in "large 
> > file random reads" it's the slowest - why this?
> 
> Any idea who is doing these runs?

IIRC the tests are run by someone from IBM, but I cannot remember
who it is.

> Once we figure out what that large
> file random reads loads is I'm sure we could fix it soon.