From owner-freebsd-hackers Thu Jun 6 15: 6:34 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from serenity.mcc.ac.uk (serenity.mcc.ac.uk [130.88.200.93]) by hub.freebsd.org (Postfix) with ESMTP id 073DA37B489 for ; Thu, 6 Jun 2002 15:05:48 -0700 (PDT) Received: from dogma.freebsd-uk.eu.org ([130.88.200.97]) by serenity.mcc.ac.uk with esmtp (Exim 2.05 #6) id 17G5O6-000Mww-00 for freebsd-hackers@freebsd.org; Thu, 6 Jun 2002 23:05:46 +0100 Received: (from jcm@localhost) by dogma.freebsd-uk.eu.org (8.11.6/8.11.1) id g56M5kf79106 for freebsd-hackers@freebsd.org; Thu, 6 Jun 2002 23:05:46 +0100 (BST) (envelope-from jcm) Date: Thu, 6 Jun 2002 23:05:45 +0100 From: j mckitrick To: freebsd-hackers@freebsd.org Subject: SMP/5.0 performance on single CPU? Message-ID: <20020606230545.A78993@dogma.freebsd-uk.eu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0.1i Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hi all, I'm sure the SMP features along with removal of the Big Giant Lock (TM) are designed to sacrifice as little performance as possible across the board. In practical terms, will a 5.0 kernel without SMP have any performance loss at all on a single CPU machine compared with the 4.x kernel we use now? I once read here on one of these lists that the Solaris fine-grained locking was great for SMP, but was a lot of overhead for single CPU machines (correct me if I misunderstood). If there's a discussion you can point me to that will save the trouble of explaining it (again) let me know. NOTE: Please CC me, as I am not currently subscribed. Thanks. jm -- My other computer is your windows box. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message