Date:        Thu, 28 Feb 2002 09:37:31 +0000
    From:        David Laight <david@l8s.co.uk>
    Message-ID:  <20020228093731.A447@snowdrop.l8s.co.uk>

  | I take it that only the last bit of a file can be a fragment.

Yes, frags optimise the common expensive case when dealing with
larger block sizes - small files without holes.

  | My experiments with 'ls -s' couldn't tell the difference.

Something needs to look at exactly what you were doing there, and
how the numbers reported were produced.  Some of them made little sense
(but I didn't look at it closely enough to see why).

kre