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

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Date:	Wed, 12 Dec 2007 09:55:47 +0000
From:	Luciano Rocha <luciano@...otux.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 Wed, Dec 12, 2007 at 12:31:18AM +0100, 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 to port 
>  0x80 takes. It measures in CPU cycles so CPU speed is crucial in reporting.
> 

$ sudo ./port80
cycles: out 2729, in 1872
$ sudo ./port80
cycles: out 2729, in 1872
$ sudo ./port80
cycles: out 2711, in 1856
$ sudo ./port80
cycles: out 2711, in 1856

model name      : Intel(R) Pentium(R) 4 CPU 1.90GHz
stepping        : 2
cpu MHz         : 1917.229
cache size      : 256 KB

-- 
Luciano Rocha <luciano@...otux.com>
Eurotux Informática, S.A. <http://www.eurotux.com/>

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