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	  id WAA06416; Sun, 3 Aug 1997 22:49:39 +0200 (MESZ)
From: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de>
Message-Id: <199708032049.WAA06416@ghost.mep.ruhr-uni-bochum.de>
Subject: Re: Pentium II?
In-Reply-To: <199708031631.JAA01116@hub.freebsd.org> from "Jonathan M. Bresler" at "3. Aug. 97  9:28:43"
To: jmb@FreeBSD.ORG (Jonathan M. Bresler)
Date: Sun, 3 Aug 1997 22:49:38 +0200 (MESZ)
Cc: tony@dell.com, cjs@portal.ca, freebsd@atipa.com, tom@sdf.com,
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It was Jonathan M. Bresler who wrote:
[...]
> 	what we need is a benchmark that has a fixed data access pattern
> 	and known data set size.  better yet would be one that starts with
> 	a very small data set and grows the data set till the computer starts
> 	using disk.  a graph of the results would show the speed of the 
> 	machine accross all its memory regimes.
> 
> 	http://www.scl.ameslab.gov/scl/HINT/HINT.html

What about lat_mem_rd from lmbench1.0 in the ports ?
I would like to see some numbers for a Pentium II.

>From a comparison between a PPro (thanks to Christoph Kukulies) and
a Pentium-166, I learned that the L1 in the PPro seems to work with
half the speed of the P5.

lat_mem_rd 8 128  on a P5-166
$Id: lat_mem_rd.c,v 1.1 1994/11/18 08:49:48 lm Exp $
$Id: mhz.c,v 1.1 1994/11/18 08:51:55 lm Exp $
"stride=128
0.00049 6
0.02930 69
0.03125 69
2.00000 135
2.50000 137


> PPRO 200/256
> 
> $Id: lat_mem_rd.c,v 1.1 1994/11/18 08:49:48 lm Exp $
> $Id: mhz.c,v 1.1 1994/11/18 08:51:55 lm Exp $
> "stride=128
> 0.00049 10            <-- Das überrascht mich !
> 0.02930 30
> 0.03125 30
> 2.00000 196
> 2.50000 197

I noticed this speed difference in the run-time comparison
of one of my numerical programs.

Robert

-- 
Robert Eckardt                \\ FreeBSD -- solutions for a large universe.(tm)
RobertE@MEP.Ruhr-Uni-Bochum.de \\       What do you want to boot tomorrow ?(tm)
http://WWW.MEP.Ruhr-Uni-Bochum.de/~roberte
For PGP-key finger roberte@gluon.MEP.Ruhr-Uni-Bochum.de