>Performance?  If the files are large and already compressed, JPEG or
>MPEG for example.

That would still be a filesystem property: the performance issue
only rears its head when the file is written and compression is
attempted but fails (userland compressed files are not stored compressed:
the compression algorithm detects that there is no advantage in compressing
and then stores the file or blocks of the file uncompressed)

What you need is the ability of the filesystem to predict when compression
should not be attempted.  That's a filesystem property, not a per-file
property.

Casper
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