From owner-freebsd-arch@FreeBSD.ORG  Wed Aug 10 20:10:10 2005
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
X-Original-To: freebsd-arch@freebsd.org
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id EB9CE16A41F;
	Wed, 10 Aug 2005 20:10:10 +0000 (GMT) (envelope-from frank@exit.com)
Received: from tinker.exit.com (tinker.exit.com [206.223.0.1])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 90B9143D55;
	Wed, 10 Aug 2005 20:10:06 +0000 (GMT) (envelope-from frank@exit.com)
Received: from realtime.exit.com (realtime [206.223.0.5])
	by tinker.exit.com (8.13.3/8.13.3) with ESMTP id j7AKA6DH056830;
	Wed, 10 Aug 2005 13:10:06 -0700 (PDT) (envelope-from frank@exit.com)
Received: from realtime.exit.com (localhost [127.0.0.1])
	by realtime.exit.com (8.13.3/8.13.3) with ESMTP id j7AKA5YA057067;
	Wed, 10 Aug 2005 13:10:05 -0700 (PDT) (envelope-from frank@exit.com)
Received: (from frank@localhost)
	by realtime.exit.com (8.13.3/8.12.9/Submit) id j7AKA5sA057066;
	Wed, 10 Aug 2005 13:10:05 -0700 (PDT) (envelope-from frank@exit.com)
X-Authentication-Warning: realtime.exit.com: frank set sender to
	frank@exit.com using -f
From: Frank Mayhar <frank@exit.com>
To: John Baldwin <jhb@freebsd.org>
In-Reply-To: <200508100911.50004.jhb@FreeBSD.org>
References: <42F9ECF2.8080809@freebsd.org> <200508100911.50004.jhb@FreeBSD.org>
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Organization: Exit Consulting
Date: Wed, 10 Aug 2005 13:10:05 -0700
Message-Id: <1123704605.54957.8.camel@realtime.exit.com>
Mime-Version: 1.0
X-Mailer: Evolution 2.2.3 FreeBSD GNOME Team Port 
X-Virus-Scanned: ClamAV 0.86.1/1011/Tue Aug 9 02:20:28 2005 on tinker.exit.com
X-Virus-Status: Clean
Cc: Andre Oppermann <andre@freebsd.org>, freebsd-arch@freebsd.org
Subject: Re: Special schedulers, one CPU only kernel, one only userland
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: frank@exit.com
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 10 Aug 2005 20:10:11 -0000

On Wed, 2005-08-10 at 09:11 -0400, John Baldwin wrote:
> I think this is the model that BSD/OS employed 
> for SMP in its 4.x series before they did their version of SMPng.

I didn't grunge around in the scheduler (much), but as far as I'm aware
BSD/OS 4.x used the Big Giant Lock mechanism just as FreeBSD did, and
for the same reason.
-- 
Frank Mayhar frank@exit.com     http://www.exit.com/
Exit Consulting                 http://www.gpsclock.com/
                                http://www.exit.com/blog/frank/