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

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Date:	Wed, 12 Dec 2007 09:00:05 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ondrej Zary <linux@...nbow-software.org>
CC:	Rene Herman <rene.herman@...il.com>,
	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,
	john@...ffel.org, linux-os@...logic.com
Subject: Re: [RFT] Port 0x80 I/O speed

Ondrej Zary wrote:
> 
> Cyrix MII PR300 (225MHz), i430TX:    cycles: out 263, in 93
> Pentium MMX 166MHz @133MHz, VIA VPX: cycles: out 163, in 163
> Celeron 433MHz, i440BX:              cycles: out 620, in 305
> Celeron 1.3GHz, i440BX:              cycles: out 2114, in 849
> Celeron 1.7GHz (P4-based), i845:     cycles: out 2178, in 1651
> Pentium 4 3.2GHz, i925X:             cycles: out 2824, in 1899
> Xeon E5310 1.6GHz, Dell PE1950       cycles: out 2631, in 1606
> Xeon 3050 2.13GHz, Dell PE860        cycles: out 3367, in 1959
> 

So between 0.88 and 1.6 µs for the out case; 0.4 and 1.0 µs for the in case.

	-hpa

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