Re: Transparent compression in the FS

[Nikita Danilov]

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.

 > 

Nikita.

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