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SubjectRe: Transparent compression in the FS
On Wed, 15 Oct 2003, Erik Mouw wrote:
> On Wed, Oct 15, 2003 at 06:33:03PM +0400, Nikita Danilov wrote:
> > 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.
>
> I'm not too sure about this. It's my feeling that CPU speed and disk
> throughput grow about as fast. I don't have hard figures, so I can be
> proven wrong on this.

Well, let's take some (exotic :-) examples:

- 1989: Amiga 500, 7.14 MHz 68000, expensive SCSI disk, 675 KB/s
- 1992: Amiga 4000, 25 MHz 68040, IDE, 1.8 MB/s (SCSI with 5 MB/s should have
been possible)
- 1998: CHRP, 200 MHz 604e, UW-SCSI, 17 MB/s

The third CPU is ca. 25 times faster than the second (both in BogoMIPS as
kernel cross-compiles). The disk isn't 25 faster, though.

Now you can buy a machine with a CPU that's 25 times faster again, but please
show me a 400 MB/s disk...

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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