linux-kernel - Re: [RFT] Port 0x80 I/O speed

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Date:	Wed, 12 Dec 2007 01:01:05 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	nigel@...el.suspend2.net
CC:	Linux Kernel <linux-kernel@...r.kernel.org>, dpreed@...d.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>, pavel@....cz,
	andi@...stfloor.org, rol@...917.net,
	Krzysztof Halasa <khc@...waw.pl>, david@...idnewall.com,
	hpa@...or.com, john@...ffel.org, linux-os@...logic.com
Subject: Re: [RFT] Port 0x80 I/O speed

On 12-12-07 00:55, Nigel Cunningham wrote:

> (AMD 1.8GHz Turion, running at 800MHz. ATI RS480 - Mitac 8350 mobo)
> 
> nigel@...e:~/Downloads$ gcc port80.c -o port80
> nigel@...e:~/Downloads$ sudo ./port80
> cycles: out 1235, in 1207

Looking good.

> nigel@...e:~/Downloads$ gcc -O2 port80.c -o port80
> nigel@...e:~/Downloads$ sudo ./port80
> cycles: out 1844674407370794, in 1844674407369408

Obviously not. I suppose this changes with -m32 on the GCC command line? 
(sorry for missing that, I have no 64-bit machines).

Rene.
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