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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Message-ID: <20071214142355.GA10130@elte.hu>
Date:	Fri, 14 Dec 2007 15:23:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rene Herman <rene.herman@...il.com>
Cc:	"David P. Reed" <dpreed@...d.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80
	on some AMD64x2 laptops, etc.


* Rene Herman <rene.herman@...il.com> wrote:

> --- a/init/main.c
> +++ b/init/main.c
> @@ -229,10 +229,9 @@ static int __init obsolete_checksetup(char *line)
>  }
>
>  /*
> - * This should be approx 2 Bo*oMips to start (note initial shift), and will
> - * still work even if initially too large, it will just take slightly longer
> + * Initial value roughly corresponds to a 1 GHz CPU
>   */
> -unsigned long loops_per_jiffy = (1<<12);
> +unsigned long loops_per_jiffy = 1000000000 / HZ;
>
>  EXPORT_SYMBOL(loops_per_jiffy);

this is a factor of ~2400 increase - this will take an eternity to boot 
on any older CPU.

	Ingo
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