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

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Date:	Wed, 12 Dec 2007 13:57:01 +0200
From:	Ville Syrjälä <syrjala@....fi>
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.

vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU          6600  @ 2.40GHz
stepping        : 6

cpu MHz         : 2394.000
cycles: out 1830, in 1166

cpu MHz         : 1596.000
cycles: out 1925, in 1266

##

vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Pentium III (Coppermine)
stepping        : 10

cpu MHz         : 850.000
cycles: out 1142, in 475

cpu MHz         : 700.000
cycles: out 914, in 406

##

vendor_id       : AuthenticAMD
cpu family      : 6
model           : 7
model name      : AMD Duron(tm) processor
stepping        : 1

cpu MHz         : 1300.108
cycles: out 2562, in 2562

##

vendor_id       : GenuineIntel
cpu family      : 6
model           : 5
model name      : Pentium II (Deschutes)
stepping        : 2

cpu MHz         : 449.242
cycles: out 607, in 272

-- 
Ville Syrjälä
syrjala@....fi
http://www.sci.fi/~syrjala/
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