From owner-freebsd-current@FreeBSD.ORG Fri Mar 21 14:52:21 2008 Return-Path: Delivered-To: current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id CF779106566C for ; Fri, 21 Mar 2008 14:52:21 +0000 (UTC) (envelope-from wearabnet@yahoo.ca) Received: from web33702.mail.mud.yahoo.com (web33702.mail.mud.yahoo.com [68.142.201.199]) by mx1.freebsd.org (Postfix) with SMTP id 9B9088FC16 for ; Fri, 21 Mar 2008 14:52:21 +0000 (UTC) (envelope-from wearabnet@yahoo.ca) Received: (qmail 62375 invoked by uid 60001); 21 Mar 2008 14:52:21 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.ca; h=X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:MIME-Version:Content-Type:Message-ID; b=az5F/wWSZz9xcA2iD4YIDhvsChockjBUY4PK1I3VLp3GwgbwduIffs96dLTLHCPhvkBxbHz8KtKSX8m8dB17+6oiq6ukH7Qc4iwcBMEftmQxPLtZCkykQCET04V0hfKmAV270jraWOjoDs6ipu1Zc1ZSlVYlMJMN8DSswbqAm10=; X-YMail-OSG: EaWPBOQVM1lwbCBgnjI8z8kOyWitWffzIZDanb5hCQqt.kIA0jF8nv2H1YKhtcJIAIsEqpI2NixU6ZM.LJduNb0zjljDvEZHev5nwRCddREXjO0z8Gak_9Z6IhWg.mVYGbIF_ZBs7Q-- Received: from [86.62.225.3] by web33702.mail.mud.yahoo.com via HTTP; Fri, 21 Mar 2008 07:52:20 PDT X-Mailer: YahooMailRC/902.38 YahooMailWebService/0.7.162 Date: Fri, 21 Mar 2008 07:52:20 -0700 (PDT) From: Abdullah Ibn Hamad Al-Marri To: Maxim Sobolev MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Message-ID: <994010.61982.qm@web33702.mail.mud.yahoo.com> Cc: FreeBSD Current Subject: Re: Speed Step and powerd for servers status? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Mar 2008 14:52:21 -0000 ----- Original Message ---- > From: Maxim Sobolev > To: Abdullah Ibn Hamad Al-Marri > Cc: FreeBSD Current > Sent: Tuesday, March 18, 2008 10:49:29 PM > Subject: Re: Speed Step and powerd for servers status? > > Abdullah Ibn Hamad Al-Marri wrote: > > Hey, > > > > > > I would like to use powerd and speed step for my servers, and make sure it > will use the MAX CPU if needed then go to idle mode to save the power. > > > > Any recommendation? > > It's questionable whether or not it will have positive effect on the server: > > > The combination of processor-frequency scaling and idle-power states > provides a somewhat surprising result. On almost all modern hardware, if > there is code to run, then it is more power efficient to run the > processor at full speed. This "race to idle" concept stems from the > power consumption of an idle processor being much lower than an active > processor, even if running at a lower speed. The overall power > consumption will be less if the processor spends a short time at full > speed and then falls back to idle, rather than spending twice as long > being active at a lower frequency. > > > Full text is here: > > http://www.acmqueue.com/modules.php?name=Content&pa=showpage&pid=513 > > -Maxim > Helli Maixm, Did you try it with mysql bench or ubench? Regards, -Abdullah Ibn Hamad Al-Marri Arab Portal http://www.WeArab.Net/ ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs