Date: Fri, 14 Dec 2007 15:23:55 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Rene Herman <rene.herman@gmail.com>
Cc: "David P. Reed" <dpreed@reed.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org,
       Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
       Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80
	on some AMD64x2 laptops, etc.
Message-ID: <20071214142355.GA10130@elte.hu>
References: <1181682498.8176.224.camel@chaos> <469578CD.3080609@reed.com> <1184216528.12353.203.camel@chaos> <1184218962.12353.209.camel@chaos> <46964352.7040301@reed.com> <1184253339.12353.223.camel@chaos> <469697C6.50903@reed.com> <1184274754.12353.254.camel@chaos> <4761F193.7090400@reed.com> <476250D5.8000409@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <476250D5.8000409@gmail.com>
User-Agent: Mutt/1.5.17 (2007-11-01)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 871
Lines: 27


* Rene Herman <rene.herman@gmail.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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/