From owner-freebsd-questions@freebsd.org Wed Aug 10 18:43:40 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B2045BB594B for ; Wed, 10 Aug 2016 18:43:40 +0000 (UTC) (envelope-from afiskon@devzen.ru) Received: from relay11.nicmail.ru (relay11.nicmail.ru [195.208.3.7]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 6918412A6 for ; Wed, 10 Aug 2016 18:43:40 +0000 (UTC) (envelope-from afiskon@devzen.ru) Received: from [109.70.25.214] (port=57339 helo=e733) by f06.mail.nic.ru with esmtp (Exim 5.55) (envelope-from ) id 1bXYTT-0006l6-1p; Wed, 10 Aug 2016 21:43:31 +0300 Received: from [188.123.231.37] (account afiskon@devzen.ru HELO e733) by proxy01.mail.nic.ru (Exim 5.55) with id 1bXYTR-0008MZ-Hk; Wed, 10 Aug 2016 21:43:29 +0300 Date: Wed, 10 Aug 2016 21:42:18 +0300 From: Aleksander Alekseev To: Ian Smith Cc: freebsd-questions@freebsd.org Subject: Re: Power consumption tuning Message-ID: <20160810214218.6788f2c1@e733> In-Reply-To: <20160811015734.D79687@sola.nimnet.asn.au> References: <20160811015734.D79687@sola.nimnet.asn.au> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Aug 2016 18:43:40 -0000 Hello, Ian. Thanks for a detailed reply! > Well [1] stresses the importance of using maximum available C-states > on your hardware. But except for powerd and C-states where possible, > I wouldn't bother with all that to save an extra few watts on a > desktop. > > > [1] https://wiki.freebsd.org/TuningPowerConsumption Well, I took a look on /etc/defaults/rc.conf and discovered that default values are: ``` performance_cx_lowest="C2" economy_cx_lowest="Cmax" ``` Since article describes C3 as a pretty dangerous thing I doubt that these parameters are worth tuning in my case. > What hardware? What OS version? 11.0-beta4 on Fujitsu Lifebook E733 laptop. BTW it's a great laptop for FreeBSD. Works everything including Wi-Fi adapter and hibernation. I didn't check bluetooth, webcam and fingerprint scanner though. I disabled this stuff in BIOS a long time ago since I don't use it anyway. -- Best regards, Aleksander Alekseev