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
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Subject: Re: Speed problems with AMD K6
In-reply-to: <69ocb5$4dt$1@nclient5-gui.server.virgin.net>
Precedence: bulk

"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
------------------------------------ 0 --------------------------------
Visit my home page: http://set-soft.home.ml.org/
or
http://www.geocities.com/SiliconValley/Vista/6552/
Salvador Eduardo Tropea (SET). (Electronics Engineer)
Alternative e-mail: set-sot AT usa DOT net - ICQ: 2951574
Address: Curapaligue 2124, Caseros, 3 de Febrero
Buenos Aires, (1678), ARGENTINA
TE: +(541) 759 0013