linux-kernel - Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

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Date:	Sat, 15 Dec 2007 12:27:32 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rene Herman <rene.herman@...il.com>
CC:	Paul Rolland <rol@...917.net>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@....cz>, Ingo Molnar <mingo@...e.hu>,
	"David P. Reed" <dpreed@...d.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Rene Herman <rene.herman@...access.nl>, rol@...be.net
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80
 on some AMD64x2 laptops, etc.

Rene Herman wrote:
> 
> Yes, just posted a Patch-For-Comments that switches on the availability 
> of a TSC (tsc_init sets tsc_disable also for !cpu_has_tsc) which would 
> mean that only really old stuff would be using the outb still. A TSC is 
> really all we need to have a sensible udelay().
> 

Uhm, no.  You have no clue what the speed of the TSC is until you have 
been able to calibrate it against a fixed timesource - like the PIT.

	-hpa
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