lkml.org 
[lkml]   [2003]   [Oct]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
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.

>

Nikita.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:49    [from the cache]
©2003-2011 Jasper Spaans. Advertise on this site