From owner-freebsd-stable Fri Feb 28 11:16:10 2003 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 301F637B40F for ; Fri, 28 Feb 2003 11:15:47 -0800 (PST) Received: from noao.edu (email.tuc.noao.edu [140.252.1.54]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6AEF144412 for ; Fri, 28 Feb 2003 11:11:58 -0800 (PST) (envelope-from grandi@noao.edu) Received: from rigel.tuc.noao.edu ([140.252.1.16] verified) by noao.edu (CommuniGate Pro SMTP 4.0.3) with ESMTP-TLS id 6636355 for freebsd-stable@freebsd.org; Fri, 28 Feb 2003 12:11:58 -0700 Date: Fri, 28 Feb 2003 12:11:57 -0700 (US Mountain Standard Time) From: Steve Grandi To: freebsd-stable@freebsd.org Subject: hyperthreading in STABLE: should machdep.cpu_idle_hlt be on? Message-ID: X-X-Sender: grandi@email.noao.edu MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG I've brought up STABLE on a Supermicro X5DPR-8G2+ motherboard which has two 2.4GHz Xeons. In the BIOS setup, I disabled hyperthreading. The BIOS even prints out a nice message during the POST that hyperthreading is disabled. The BIOS setting notwithstanding, STABLE fires up hyperthreading and presents me with 4 cpus! OK, I will go with the flow: but what is the current wisdom about machdep.cpu_idle_hlt? Should I set it to 1 to avoid a loss of performance and to avoid frying the box? -- Steve Grandi National Optical Astronomy Observatory/AURA Inc., Tucson AZ USA Internet: grandi@noao.edu Voice: +1 520 318-8228 FAX: +1 520 318-8360 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message