Fw: Fw: DOS performance on the OmniGo
William Ofosu-Amaah (XI6W-OFSA@asahi-net.or.jp)
Tue, 20 Aug 1996 09:14:20 +0900
> -- [ From: Man F Wong * EMC.Ver #2.3 ] --
>
> Hi, y'all! I'm following up on my post regarding DOS performance on the
> Ogo.
>
> Man F Wong wrote:
> > FYI, I ran the MIPS.COM v1.2 benchmark on the OmniGo in DOS mode. For
> some
> > reasons uncertain to me, the OmniGo's performance on this simple
> benchmark
> > was roughly 25% poorer than the 8Mhz HP200lx despite the OmniGo's 16Mhz
> 186-
> > class cpu. Here are the results:
> >
> > 4.7Mhz XT 8Mhz AT Compaq 386 | Actual MIPS
> > General Instructions 1.20 .35 .18 | .19
> > Integer Instructions 2.39 .37 .16 | .40
> > Memory to Memory 1.13 .35 .19 | .26
> > Register to Register 3.12 .41 .17 | .56
> > Register to Memory 1.19 .36 .20 | .36
> > |
> > Overall Performance 1.52 .37 .18 | .35
> >
> > A poster (Kerry Podolsky) to comp.sys.palmtops recently tested the
> HP200lx
> > and received results of 1.98 and .48 for overall performance compared
to
> > the XT and the AT respectively. I'm not sure what to make of the
> OmniGo's
> > slower than expected performance. Perhaps, it uses slower components
> > external to the cpu, eg. bus, memory, etc. Maybe somebody around here
> can
> > figure it out, but at least now you have some idea of the OmniGo's
> > performance compared to other x86/88 systems.
>
> I finally got around to configuring my Ogo to launch into mini-DOS from
> w/in GEOS (using the geodes from Bindery). Anyway, I ran MIPS.COM under
> the mini-DOS prompt, and found some interesting results which boggle my
> mind. Compare them for yourselfs:
>
> 4.7Mhz XT 8Mhz AT Compaq 386 | Actual MIPS
> General Instructions 3.98 1.16 .58 | .66
> Integer Instructions 7.99 1.25 .55 | 1.34
> Memory to Memory 3.78 1.16 .65 | .90
> Register to Register 10.45 1.36 .67 | 1.88
> Register to Memory 3.99 1.20 .66 | 1.23
> |
> Overall Performance 5.06 1.22 .60 | 1.20
>
> Can anyone shed some light on why the Ogo seems to do >=3x better in ALL
> categories of MIPS.COM under a mini-DOS launched from GEOS vs straight
mini-
> DOS?
>
> I can't think of any reasons for this dramatic tripling of DOS
performance
> unless the Ogo boots up at 1/3 its potential clock-rate (ala PC in non-
> turbo mode) and then GEOS switches it upto the full 16Mhz. This would
also
> make sense of why the 8Mhz HP200lx runs roughly 1/3 faster than the Ogo
in
> my original post.
>
> Or maybe MIPS.COM uses a faulty algorithm w/ a "loophole" that GEOS-
> launched mini-DOS somehow hits on... unlikely as that may be...
>
> If indeed DOS performance is 3x better under GEOS-launched mini-DOS, then
> that's a huge additional plus for configuring DOS usage on your Ogo that
> way.
>
> BTW, it seems that the Battery Watcher does NOT log DOS usage in any way,
> so one should take that into consideration in the battery life logs
> especially if DOS usage is significant.
>
> _Man_
>
> PS: May I trouble you to forward my message to the OGO mailing-list once
> again? Thanx.