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

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Date:	Wed, 12 Dec 2007 10:39:40 -0800
From:	"SL Baur" <steve@...acs.org>
To:	"Rene Herman" <rene.herman@...il.com>
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 12/11/07, Rene Herman <rene.herman@...il.com> wrote:
> Good day.
>
> Would some people on x86 (both 32 and 64) be kind enough to compile and run
> the attached program? This is about testing how long I/O port access to port
> 0x80 takes. It measures in CPU cycles so CPU speed is crucial in reporting.

model name      : Intel(R) Pentium(R) 4 CPU 3.20GHz
cpu MHz         : 3201.345

cycles: out 3026, in 2204
cycles: out 3031, in 2182
cycles: out 3019, in 2196
cycles: out 3030, in 2201
cycles: out 3013, in 2186

-sb
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