From owner-freebsd-current@FreeBSD.ORG Wed Jan 16 12:38:17 2008 Return-Path: Delivered-To: freebsd-current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2E56B16A419; Wed, 16 Jan 2008 12:38:17 +0000 (UTC) (envelope-from sobomax@digifonica.com) Received: from sippysoft.com (gk1.360sip.com [72.236.70.240]) by mx1.freebsd.org (Postfix) with ESMTP id 3835113C45A; Wed, 16 Jan 2008 12:38:15 +0000 (UTC) (envelope-from sobomax@digifonica.com) Received: from [192.168.0.3] ([204.244.149.125]) (authenticated bits=0) by sippysoft.com (8.13.8/8.13.8) with ESMTP id m0CLSdqu055226 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 12 Jan 2008 13:28:41 -0800 (PST) (envelope-from sobomax@digifonica.com) Message-ID: <478930D2.90806@digifonica.com> Date: Sat, 12 Jan 2008 13:27:46 -0800 From: Maxim Sobolev Organization: DIGIFONICA CANADA INC User-Agent: Thunderbird 2.0.0.9 (Windows/20071031) MIME-Version: 1.0 To: Igor Mozolevsky References: <20080111181344.5E7244500E@ptavv.es.net> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Wed, 16 Jan 2008 12:45:14 +0000 Cc: njl@FreeBSD.org, bruno@FreeBSD.org, Stefan Lambrev , freebsd-current@FreeBSD.org, =?ISO-8859-1?Q?Dag-Erling_Sm=F8rgrav?= Subject: Re: powerd adaptive mode latching 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: Wed, 16 Jan 2008 12:38:17 -0000 I wonder if somebody did measurement of power consumption with powerd and without it on typical tasks. There is very interesting idea in the last issue of ACM Queue that it might be much more beneficial to run CPU at the full speed and then switch it to low-power mode as soon as possible in the idle loop than to run longer at reduced speed for a longer period of time. -Maxim