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From: lkoop@pnet01.cts.com (Lamonte Koop)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Slow GVP '030 accelerator board
Message-ID: <5801@crash.cts.com>
Date: 22 Nov 90 09:56:01 GMT
Sender: root@crash.cts.com
Organization: People-Net [pnet01], El Cajon CA
Lines: 50

daveh@cbmvax.commodore.com (Dave Haynie) writes:
>>If this GVP board is being tested with any of the benchmarking tests I've seen 
>>though (Ronin CPUSpeed, etc...), I'd more expect a reading as I mentioned 
>>before.
>
>First thing you do, erase any copies of the Ronin CPUSpeed test you have 
>around.  That test basically measures CPU register speed, and as a side effect
>has a component that's based on memory speed.  It tells you absolutely nothing
>about system performance.  It is totally useless.  It will tell you that a
>50MHz 68030 system running out of slow 16 bit memory is faster than a 16MHz
>68030 system running out of nearly 0 wait state 32 bit memory, which is totally
>wrong.

I totally agree with you here...but what I was trying to point out earlier is
that IF the individual in question here WAS using that (or any similar)
program, and only getting 20%, then something is wrong.  My own benchmarking
program shows interesting things in this respect. [AIBB]. The Dhrystone on
AIBB shows a 40% increase over an A2000 (68000 based) WITH both 030 caches ON,
and about 15-20% at best with only the instruction cache on. [I haven't the
heart to turn the instruction cache off ;-)] AIBB also has a few of those
'meaningless' benchmarks incorporated...and they show higher to a
degree...interesting what you can fiddle with here. [Anyone else reading this,
TOSS AIBB v1.0! The A3000 figures are WRONG...v2.01 is latest, and is
correct...to whatever degree a benchmark can be correct].

>
>While I can't recommend any really trustworthy benchmarks, Dhrystone 2.x is a
>decent one.  Though, on the same hardware, you can easily get a 2:1 range of
>results depending on the compiler you use, sometimes even between different
>options on the same compiler.  So simply quoting Dhrystones tends to be rather
>meaningless without also including the compiler information, unless you're
>simply going for bragging rights against a Mac or IBM.  

Yes...different compilers definitely show differences...and certainly what you
get depends upon your compile options.  For benchmarks, many compilers have a
tendency to optimize the benchmark code away, making them entirely useless. 
In those cases, the benchmark no longer test machine performance, but compiler
optimization efficiency.

>Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
>   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
>	Standing on the shoulders of giants leaves me cold	-REM


--LaMonte  


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