Message-Id:	<m0xuC00-000S2nC@inti.gov.ar>
Comments:	Authenticated sender is <salvador AT natacha DOT inti DOT gov DOT ar>
From:	"Salvador Eduardo Tropea (SET)" <salvador AT inti DOT gov DOT ar>
Organization:	INTI
To:	"Gary Smith" <gary DOT smith3 AT virgin DOT net>, djgpp AT delorie DOT com
Date:	Mon, 19 Jan 1998 11:13:06 +0000
MIME-Version:	1.0
Subject:	Re: Speed problems with AMD K6
In-reply-to:	<69ocb5$4dt$1@nclient5-gui.server.virgin.net>

"Gary Smith" <gary DOT smith3 AT virgin DOT net> wrote:

> I have just changed my CPU from a Cyrix 6x86 P166+ to an AMD K6 166MHz, and
> have noticed a drop in performance with programmes written using using DJGPP
> and Allegro.  The drop in performance is in the region of 20%.
> 
> I have benchmarked the AMD and the Cyrix using Wintune 97, and in all the
> tests the AMD is faster than the Cyrix. eg:
> 
> Floating Point Performance (MFLOPS)
> -------------------------------------------------------
> AMD K6 P166               98
> Cyrix 6x86 P166+          52
> 
> Integer Performance  (MIPS)
> -----------------------------------------
> AMD K6 P166               320
> Cyrix 6x86 P166+          250
> 
> Does anyone have any ideas as to the cause of the performance drop with the
> AMD CPU ?

How did you tested the DJGPP+Allegro performance? With a frame rate?
If that's the case perhaps the video speed had dropped in your system. It can 
be related to a change in BUS clock (the CPUs are both 166MHz, but normally 
Cyrix and AMD cheat and the clock is different).

SET
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Visit my home page: http://set-soft.home.ml.org/
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Salvador Eduardo Tropea (SET). (Electronics Engineer)
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Address: Curapaligue 2124, Caseros, 3 de Febrero
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