Re: xfs_fsr, performance related tweaks

[David Chinner <dgc@sgi.com>]

On Sat, Jun 30, 2007 at 01:17:29PM -0400, Eric Sandeen wrote:
> David Chinner wrote:
> > On Fri, Jun 29, 2007 at 08:16:28AM +0100, Just Marc wrote:
> >> David,
> >>
> >> In my first post I already said something like that can be done but it's 
> >> just an ugly hack.   Don't you think it would best be handled cleanly 
> >> and correctly by fsr itself?
> > 
> > No, I don't - if you want files not to be defragmented, then you
> > have to set the flags yourself in some way. You have a specific need
> > that can be solved by some scripting to describe your defrag/no
> > defrag policy. xfs_fsr has no place is setting defrag policy; it's
> > function is simply to find and defrag files.
> 
> I wouldn't mind seeing a way to tell fsr to not worry about defragging
> some files based on current layout; say if the avg extent in the file is
> > 100MB, or > 1G, don't bother... if today you have a 4.7G DVD iso image
> in 3 extents (not bad) fsr will try to "fix" it for you right?

That could be easily done with command line options, I think. Define
the minimum extent length or number of extents we want files to have
and ignore those that are outside that criteria.

Cheers,

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