linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Message-ID: <475EBD69.9090709@keyaccess.nl>
Date:	Tue, 11 Dec 2007 17:40:09 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	John Stoffel <john@...ffel.org>
CC:	Paul Rolland <rol@...917.net>,
	David Newall <david@...idnewall.com>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Pavel Machek <pavel@....cz>, Andi Kleen <andi@...stfloor.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
 with MCP51 laptops

On 11-12-07 17:32, John Stoffel wrote:

> Here's my results on a PIII Xeon, 550mhz, 440GX chipset, and an ISA
> slot, which until recently was actually used with an 8 port serial
> card:
> 
> jfsnew:~/src> sudo ./port80
> out: 729
> in : 348
> jfsnew:~/src> sudo ./port80
> out: 729
> in : 354
> jfsnew:~/src> sudo ./port80
> out: 729
> in : 350
> jfsnew:~/src> sudo ./port80
> out: 728
> in : 346
> jfsnew:~/src> sudo ./port80
> out: 730
> in : 340

Thank you. That's a little odd. The "in" time should be close to the "out" 
time really.

Well, err, <shrug> I guess.

For now noone's contemplating replacing the out with an in anyways :-)

Rene.

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