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SubjectRe: Transparent compression in the FS
Erik Bourget writes:
> Erik Mouw <erik@harddisk-recovery.com> 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).
> >
> > Erik
> >
> > PS: let me guess: among other things, reiser4 comes with transparent
> > compression? ;-)
>
> Reiser4 made my coffee this morning, it's wonderful :)
>
> Seriously, though, (and getting off the topic), has anyone started to use
> reiser4 in a high-load environment? I've got a mail system that shoots a few
> million messages through it every day and a filesystem that's faster with
> creating and deleting tons of ~4kb qmail queue files (with data journaling!)
> would be verrry innnteresting.

Please, don't use reiser4 in production environments. It is still in the
late debugging stage. Stay tuned, as they say. :)

>
> - Erik Bourget
>

Nikita.
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