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SubjectRe: Transparent compression in the FS
Erik Mouw writes:
> On Wed, Oct 15, 2003 at 05:50:38PM +0400, Nikita Danilov wrote:
> > Erik Mouw writes:
> > > Nowadays disks are so incredibly cheap, that transparent compression
> > > support is not realy worth it anymore (IMHO).
> >
> > But disk bandwidth is so incredibly expensive that compression becoming
> > more and more useful: on compressed file system bandwidth of user-data
> > transfers can be larger than raw disk bandwidth. It is the same
> > situation as with allocation of disk space for files: disks are cheap,
> > but storing several files in the same block becomes more advantageous
> > over time.
> You have a point, but remember that modern IDE drives can do about
> 50MB/s from medium. I don't think you'll find a CPU that is able to
> handle transparent decompression on the fly at 50MB/s, even not with a
> simple compression scheme as used in NTFS (see the NTFS docs on
> SourceForge for details).

Trend is that CPU is getting faster and faster with respect to the
disk. So, even if it were hard to find such a CPU to-day, it will be
common place to-morrow.

> Erik
> PS: let me guess: among other things, reiser4 comes with transparent
> compression? ;-)

Yes, it will.



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