From owner-freebsd-questions@FreeBSD.ORG Sat Mar 26 19:39:12 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9565916A4CE for ; Sat, 26 Mar 2005 19:39:12 +0000 (GMT) Received: from imo-m27.mx.aol.com (imo-m27.mx.aol.com [64.12.137.8]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0959243D53 for ; Sat, 26 Mar 2005 19:39:12 +0000 (GMT) (envelope-from EM1897@aol.com) Received: from EM1897@aol.com by imo-m27.mx.aol.com (mail_out_v37_r5.33.) id n.158.4d7b47bb (15877) for ; Sat, 26 Mar 2005 14:39:04 -0500 (EST) Received: from mblk-d34 (mblk-d34.mblk.aol.com [205.188.212.218]) by air-id07.mx.aol.com (v104.18) with ESMTP id MAILINID74-3e054245ba5835a; Sat, 26 Mar 2005 14:39:04 -0500 Date: Sat, 26 Mar 2005 14:39:04 -0500 Message-Id: <8C700529A2DFD74-A44-3A157@mblk-d34.sysops.aol.com> From: em1897@aol.com References: <1641928994.20050326192811@wanadoo.fr> Received: from 24.47.116.25 by mblk-d34.sysops.aol.com (205.188.212.218) with HTTP (WebMailUI); Sat, 26 Mar 2005 14:39:04 -0500 X-MB-Message-Source: WebUI X-MB-Message-Type: User In-Reply-To: <1641928994.20050326192811@wanadoo.fr> X-Mailer: AOL WebMail 1.0.0.11984 Content-Type: text/plain; charset="us-ascii"; format=flowed MIME-Version: 1.0 To: freebsd-questions@freebsd.org X-AOL-IP: 205.188.212.218 Subject: Re: hyper threading. X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 Mar 2005 19:39:12 -0000 This is the kind of disinformation I have been referring to.... You'll get much better performance with 1 processor in UP mode. I suggest you do some testing. -----Original Message----- From: Anthony Atkielski To: freebsd-questions@freebsd.org Sent: Sat, 26 Mar 2005 19:28:11 +0100 Subject: Re: hyper threading. Perttu Laine writes: > I have 3,4ghz ht processor and freebsd shows up only one processors. I > suppose it should show two in ht models? so, GENERIC kernel doesn't > support it? but should I add to kernel config to enable it? by reading > config examples I think this should be enough: > > options SMP Yes, that's all you need. Just add that line, rebuild and reinstall the kernel, and you're all set. Works great. Hyperthreading doesn't buy you as much as truly separate processors, but it helps you get more bang for the buck out of your single processor (depending on the type of workload you run).