From owner-freebsd-smp@FreeBSD.ORG Fri Apr 25 09:36:56 2003 Return-Path: Delivered-To: freebsd-smp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6843F37B401 for ; Fri, 25 Apr 2003 09:36:56 -0700 (PDT) Received: from rms21.rommon.net (rms21.rommon.net [193.64.42.200]) by mx1.FreeBSD.org (Postfix) with ESMTP id 04D9F43F3F for ; Fri, 25 Apr 2003 09:36:55 -0700 (PDT) (envelope-from pete@he.iki.fi) Received: from PHE (h93.vuokselantie10.fi [193.64.42.147]) by rms21.rommon.net (8.12.6p2/8.12.6) with SMTP id h3PGaYiZ030770; Fri, 25 Apr 2003 19:36:42 +0300 (EEST) (envelope-from pete@he.iki.fi) Message-ID: <016601c30b48$f12ec1b0$932a40c1@PHE> From: "Petri Helenius" To: "jeev" References: <000301c30b44$95bc4090$0200a8c0@mainframe> Date: Fri, 25 Apr 2003 19:37:12 +0300 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 cc: freebsd-smp@freebsd.org Subject: Re: Dual 2.40ghz xeon w/hyperthreading X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: FreeBSD SMP implementation group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Apr 2003 16:36:56 -0000 >Which would give me the best performance? To disable hyperthreading or >enable machdep.cpu_idle_hlt, and if I were to enable it, it would be from >loader.conf or? If you have significant interrupt / syscall load, disable hyperthreading. If most of your work is in userland, go for idle_hlt. Someone also mentioned that current has gotten better in this regard, I havenīt tested that yet. Pete