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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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