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

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Date:	Wed, 12 Dec 2007 09:48:32 +0100
From:	Jiri Slaby <jirislaby@...il.com>
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 12/12/2007 12:31 AM, Rene Herman 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

model name      : Intel(R) Core(TM)2 Duo CPU     E6850  @ 3.00GHz

cycles: out 6490, in 3135
cycles: out 6484, in 3126
cycles: out 6511, in 3128
cycles: out 6500, in 3135
cycles: out 6492, in 3154
cycles: out 6506, in 3136
cycles: out 6516, in 3144
cycles: out 6489, in 3140
cycles: out 6492, in 3129
cycles: out 6507, in 3130

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