Date: Fri, 2 May 1997 12:16:39 +0200 From: Andreas Klemm <andreas@klemm.gtn.com> To: Steve Passe <smp@csn.net> Cc: Chuck Robey <chuckr@mat.net>, Walter Haslbeck <WH@ODS.de>, smp@FreeBSD.ORG, everybodyunix@wup.de, jk@ct.heise.de Subject: Re: Dual PPro Mainboard f. SCO SMP Message-ID: <19970502121639.37715@klemm.gtn.com> In-Reply-To: <199705020804.CAA10747@Ilsa.StevesCafe.com>; from Steve Passe on Fri, May 02, 1997 at 02:04:05AM -0600 References: <19970502093326.00399@klemm.gtn.com> <199705020804.CAA10747@Ilsa.StevesCafe.com>
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On Fri, May 02, 1997 at 02:04:05AM -0600, Steve Passe wrote:
> > > being a bi-noid I always have trouble with statistical type math,
> > ...
> > Well, am I wrong ? I saw it the other way around. Single processor
> > mode gave us the value 213.17. This is the 100% value.
> >
> > SMP gives us a better values. How good ?
> >
> > 119.08 / 213.17 = 0.55
> >
> > If it would be exactly 0.5, then it would be half the time, so
> > a 100% speedup, so factor 2. 0.55 is exactly 90% speed gain,
> > factor 1.9.
>
> as I said, this type math ain't my thing... whether its 1.79 or 1.9
> I'm pretty happy its as good as it currently is. Knowing how much room we
> have for improvement from these base numbers is very encouraging.
> We are quite inefficient at kernel locking, once we get our act together
> there it should really fly! And the current version seems to be VERY stable
> so I'm doubly happy!!
Yes indeed, fast and stable !!!
BTW: I'd like to create some more figures for further comparisons
- dual PPro System using Pentiums with 512k cache
- quad PPro System
- dual Pentium 200
- dual Pentium 200 MMX
It would be interesting to see
- how much performance gain you get using 512k
2nd level cache CPU's vs. 256k cache
- how much performance (loss) you get, when 2 CPU's have
to share the same 2nd Level cache (Pentium/MMX case)
- how much system overhead you get using a 4 CPU system
- what a MMX CPU brings for such things like compilation jobs
But ... we'll certainly never get really compareable results...
--
Andreas Klemm | klemm.gtn.com - powered by
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