From owner-freebsd-smp@FreeBSD.ORG Tue Aug 2 12:36:42 2005 Return-Path: X-Original-To: freebsd-smp@freebsd.org 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 DFFFC16A41F for ; Tue, 2 Aug 2005 12:36:42 +0000 (GMT) (envelope-from bjthomas3@gmail.com) Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.201]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6420F43D64 for ; Tue, 2 Aug 2005 12:36:38 +0000 (GMT) (envelope-from bjthomas3@gmail.com) Received: by wproxy.gmail.com with SMTP id i4so1201427wra for ; Tue, 02 Aug 2005 05:36:37 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=YGNwQv0b8VOLQVBmnhFjbK8MTWanJawewKPPr3iesvQkSaT+BSKyGeBZBLmZ5zbLMOE+tuZJuqQH9KmgEj5VRndaHKSs7W/KQhfswTOKd6icaAABoiJai9adWBP3oCLnnTbNxzhxiuLoDHIUg7J6+ZfFAE67vH9pMg54RqgYHh0= Received: by 10.54.8.9 with SMTP id 9mr850996wrh; Tue, 02 Aug 2005 05:36:37 -0700 (PDT) Received: by 10.54.42.65 with HTTP; Tue, 2 Aug 2005 05:36:37 -0700 (PDT) Message-ID: Date: Tue, 2 Aug 2005 08:36:37 -0400 From: B Thomas To: freebsd-smp@freebsd.org In-Reply-To: <20050802120036.015A616A421@hub.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline References: <20050802120036.015A616A421@hub.freebsd.org> Subject: Re: Experiences with Intel 820 Dual-Core.... X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: B Thomas List-Id: FreeBSD SMP implementation group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Aug 2005 12:36:43 -0000 The Pentium D 820 is not HT enabled. You get 2 cores, but they do not support multiple hyperthreads per core. I'm typing this on a new D 820 system, and there are 2 cores, but that's it. See http://www.intel.com/products/processor/pentium_D/index.htm for more info. As for overall performance, it's a bit of apples to oranges. My other system (hyperthreaded) had a faster clock speed, but the 820 has a larger cache and somewhat faster data paths. Overall, the dual core feels faster, but it may be the overall system and not the processor. -b > Message: 2 > Date: Mon, 1 Aug 2005 21:57:43 -0400 > From: Indigo 23 > Subject: Re: Experiences with Intel 820 Dual-Core.... > To: freebsd-smp@freebsd.org > Message-ID: <6f50eac405080118571e8e817b@mail.gmail.com> > Content-Type: text/plain; charset=3DISO-8859-1 >=20 > Well more specifically, I was just wondering if it is a wise idea to turn= on > HyperThreading (i.e. will I see any benefit performance wise)? >=20 > PS. I know about the security issue regarding HT already.