From owner-freebsd-performance@FreeBSD.ORG Mon Jul 26 12:19:37 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 7088B1065675; Mon, 26 Jul 2010 12:19:37 +0000 (UTC) (envelope-from rwatson@FreeBSD.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id 4FBFD8FC0C; Mon, 26 Jul 2010 12:19:37 +0000 (UTC) Received: from fledge.watson.org (fledge.watson.org [65.122.17.41]) by cyrus.watson.org (Postfix) with ESMTPS id CADC946B3B; Mon, 26 Jul 2010 08:19:36 -0400 (EDT) Date: Mon, 26 Jul 2010 13:19:36 +0100 (BST) From: Robert Watson X-X-Sender: robert@fledge.watson.org To: Alexander Motin In-Reply-To: <4C4B720A.6020802@FreeBSD.org> Message-ID: References: <4C4AF046.40507@FreeBSD.org> <4C4B720A.6020802@FreeBSD.org> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-hackers@freebsd.org, freebsd-performance@freebsd.org, Rui Paulo 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, 26 Jul 2010 12:19:37 -0000 On Sun, 25 Jul 2010, Alexander Motin wrote: >> The numbers that you are showing doesn't show much difference. Have you >> tried buildworld? > > If you mean relative difference -- as I have told, it's mostly because of my > CPU. It's maximal boost is 266MHz (8.3%), but 133MHz of them is enabled most > of time if CPU is not overheated. It probably doesn't, as it works on clear > table under air conditioner. So maximal effect I can expect on is 4.2%. In > such situation 2.8% probably not so bad to illustrate that feature works and > there is space for further improvements. If I had Core i5-750S I would > expect 33% boost. Can I recommend the use of ministat(1) and sample sizes of at least 8 runs per configuration? Robert > > If you mean absolute difference, here are results or four buildworld runs: > hw.acpi.cpu.cx_lowest=C1: 4654.23 sec > hw.acpi.cpu.cx_lowest=C2: 4556.37 sec > hw.acpi.cpu.cx_lowest=C2: 4570.85 sec > hw.acpi.cpu.cx_lowest=C1: 4679.83 sec > Benefit is about 2.1%. Each time results were erased and sources > pre-cached into RAM. Storage was SSD, so disk should not be an issue. > > -- > Alexander Motin > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >