From owner-freebsd-amd64@FreeBSD.ORG  Fri Feb  4 22:29:39 2005
Return-Path: <owner-freebsd-amd64@FreeBSD.ORG>
Delivered-To: freebsd-amd64@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 8A5DD16A4CE; Fri,  4 Feb 2005 22:29:39 +0000 (GMT)
Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id E81E343D45; Fri,  4 Feb 2005 22:29:38 +0000 (GMT)
	(envelope-from scottl@freebsd.org)
Received: from [192.168.254.12] (g4.samsco.home [192.168.254.12])
	(authenticated bits=0)
	by pooker.samsco.org (8.13.1/8.13.1) with ESMTP id j14MTD5H038306;
	Fri, 4 Feb 2005 15:29:13 -0700 (MST)
	(envelope-from scottl@freebsd.org)
Message-ID: <4203F750.1060102@freebsd.org>
Date: Fri, 04 Feb 2005 15:29:36 -0700
From: Scott Long <scottl@freebsd.org>
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US;
	rv:1.7) Gecko/20040514
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: John Baldwin <jhb@freebsd.org>
References: <200502041558.28521.jhb@FreeBSD.org>
In-Reply-To: <200502041558.28521.jhb@FreeBSD.org>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-Spam-Status: No, score=-2.8 required=3.8 tests=ALL_TRUSTED autolearn=failed 
	version=3.0.2
X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on pooker.samsco.org
cc: amd64@freebsd.org
cc: peter@freebsd.org
Subject: Re: [PATCH] Change atomic operations to use fences for memory
	barriers
X-BeenThere: freebsd-amd64@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Porting FreeBSD to the AMD64 platform <freebsd-amd64.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-amd64>,
	<mailto:freebsd-amd64-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-amd64>
List-Post: <mailto:freebsd-amd64@freebsd.org>
List-Help: <mailto:freebsd-amd64-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-amd64>,
	<mailto:freebsd-amd64-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 04 Feb 2005 22:29:39 -0000

John Baldwin wrote:

> The patch below changes the atomic operations on amd64 to use the cheaper 
> fence instructions for memory barriers.  I'd like people to test it to see if 
> 1) it breaks things or not, and 2) if it impacts performance either in a good 
> way or a bad way.  For this last I'm curious about both UP and SMP as my 
> initial guess is that it will help on UP but might hurt on SMP.
> 

I think you forgot the patch.

Scott