From owner-freebsd-smp@FreeBSD.ORG Fri Apr 25 10:08:10 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 CDC7037B401 for ; Fri, 25 Apr 2003 10:08:10 -0700 (PDT) Received: from mx1.boldinternet.net (ns2.bphosting.com [64.237.51.2]) by mx1.FreeBSD.org (Postfix) with SMTP id 0FE7043F85 for ; Fri, 25 Apr 2003 10:08:10 -0700 (PDT) (envelope-from jeev@boldinternet.net) Received: (qmail 54442 invoked by uid 0); 25 Apr 2003 17:08:09 -0000 Received: from unknown (HELO mainframe) (63.206.136.254) by 0 with SMTP; 25 Apr 2003 17:08:09 -0000 From: "jeev" To: "'Petri Helenius'" Date: Fri, 25 Apr 2003 10:06:25 -0700 Message-ID: <000101c30b4d$018ad950$0200a8c0@mainframe> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: <016601c30b48$f12ec1b0$932a40c1@PHE> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 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 17:08:11 -0000 Yea, box will have a lot of load going through it, nothing small, I = found machdep.cpu_idle_hlt: 0 , im going to take people's recommendation and = shut off hyperthreading. j -----Original Message----- From: Petri Helenius [mailto:pete@he.iki.fi]=20 Sent: Friday, April 25, 2003 9:37 AM To: jeev Cc: freebsd-smp@freebsd.org Subject: Re: Dual 2.40ghz xeon w/hyperthreading >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 haven=B4t tested that yet. Pete