From owner-freebsd-performance@FreeBSD.ORG Mon Sep 20 18:14:27 2010 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 238ED1065672; Mon, 20 Sep 2010 18:14:27 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from asmtpout026.mac.com (asmtpout026.mac.com [17.148.16.101]) by mx1.freebsd.org (Postfix) with ESMTP id 0B9B48FC1A; Mon, 20 Sep 2010 18:14:26 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; charset=us-ascii Received: from cswiger1.apple.com ([17.209.4.71]) by asmtp026.mac.com (Sun Java(tm) System Messaging Server 6.3-8.01 (built Dec 16 2008; 32bit)) with ESMTPSA id <0L9200JKJ2JA5N50@asmtp026.mac.com>; Mon, 20 Sep 2010 10:13:59 -0700 (PDT) X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx engine=6.0.2-1004200000 definitions=main-1009200086 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.0.10011,1.0.148,0.0.0000 definitions=2010-09-20_11:2010-09-20, 2010-09-20, 1970-01-01 signatures=0 From: Chuck Swiger In-reply-to: Date: Mon, 20 Sep 2010 10:13:58 -0700 Message-id: <24B6979E-505D-436E-AAC0-D20516C14F5D@mac.com> References: <4C4AF046.40507@FreeBSD.org> <4C959830.3060808@FreeBSD.org> To: Ivan Voras X-Mailer: Apple Mail (2.1081) Cc: freebsd-performance@freebsd.org Subject: Re: Intel TurboBoost in practice X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Sep 2010 18:14:27 -0000 On Sep 20, 2010, at 8:41 AM, Ivan Voras wrote: [ ... ] > If I understand correctly, TurboBoost is supposed to increase the frequency of one or a small number of cores only? > > What is the physical increase in frequency on this CPU when TurboBoost is enabled? It depends on how many cores are active, but it should vary between 3.2 GHz and 3.6 GHz if thermal requirements stay OK. Two pages here have a good description: http://www.anandtech.com/show/2832/4 http://www.anandtech.com/show/2832/5 Regards, -- -Chuck