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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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