From owner-freebsd-hackers@FreeBSD.ORG  Fri Apr 13 17:34:40 2012
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: by hub.freebsd.org (Postfix, from userid 1233)
	id 85B6A106566C; Fri, 13 Apr 2012 17:34:40 +0000 (UTC)
Date: Fri, 13 Apr 2012 17:34:40 +0000
From: Alexander Best <arundel@freebsd.org>
To: Mahesh Babu <maheshbabu90@yahoo.co.in>
Message-ID: <20120413173440.GA48030@freebsd.org>
References: <1334333913.65753.YahooMailNeo@web193204.mail.sg3.yahoo.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1334333913.65753.YahooMailNeo@web193204.mail.sg3.yahoo.com>
Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>
Subject: Re: Regarding core disable in FreeBSD 9
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 13 Apr 2012 17:34:40 -0000

On Sat Apr 14 12, Mahesh Babu wrote:
> How to disable a particular core in FreeBSD 9?
> How to enable it again?

i don't think it's possible to do that in freebsd. what you can do is to
disable SMP oder hyperthreading. alternatively you can assign a certain process
to a certain core.

i think there's a project to disable and enable specific cores on the fly.
freebsd is pretty far behind regarding this feature. beos was able to do this
anno 1998 or so afair.

cheers.
alex