From owner-freebsd-current@FreeBSD.ORG Sun May 4 20:40:03 2014 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 80CEF795; Sun, 4 May 2014 20:40:03 +0000 (UTC) Received: from mail-qc0-x229.google.com (mail-qc0-x229.google.com [IPv6:2607:f8b0:400d:c01::229]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 2B5B01BC9; Sun, 4 May 2014 20:40:03 +0000 (UTC) Received: by mail-qc0-f169.google.com with SMTP id e16so4465995qcx.28 for ; Sun, 04 May 2014 13:40:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type:content-transfer-encoding; bh=r4MHi5ScgQ0zKTowhWuX6Q+Cnkv+IQVjm9J6POftuVE=; b=ia1YF/0lRXjv3Ava7Bvg5eO0HupGSZlfN/t8CqyMssIofg4aQjNvRMPGBVTkaAjkYd ycU6U4GQG5L1FXjy/R1UpRnZSkhheCObryfGNhwyvhwBgtYszMZIV0S7R8n+uc/s73LT UBPqkHUN7fxzwcmi9yohnjLc4hWsDwBMvTsECVXRZh+ZbC8M4WxJntGk+2WDNTNH9VQl yEBtcqXoYlLR6Imua5p0sRW9qF0zZViqHJTCps0YfNGBIMoaVd3khDeGB86fv8xVF4ku burASou6JTwirjfwRLW4iQ/qgYxlPKNG1Y39BbRKIwUCK7ZGyiSDOacYeNRRvBeGMRhb /Psg== MIME-Version: 1.0 X-Received: by 10.224.38.138 with SMTP id b10mr5795107qae.98.1399236002343; Sun, 04 May 2014 13:40:02 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.224.191.201 with HTTP; Sun, 4 May 2014 13:40:02 -0700 (PDT) In-Reply-To: <536673ED.207@freebsd.org> References: <3F7430D7-3C0F-43E1-8EBD-8AA4F701497C@FreeBSD.org> <20140503155745.GA2457@La-Habana> <20140503192305.GA1847@La-Habana> <20140504142839.GA9271@La-Habana> <53666102.5080205@allanjude.com> <53667352.4030807@allanjude.com> <536673ED.207@freebsd.org> Date: Sun, 4 May 2014 13:40:02 -0700 X-Google-Sender-Auth: uK1fQ2_YR2kiyO0CN3oPw8W-LzU Message-ID: Subject: Re: Leaving the Desktop Market From: Adrian Chadd To: Nathan Whitehorn Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: freebsd-current X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.17 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: Sun, 04 May 2014 20:40:03 -0000 Hm, I was hoping for a little more discussion. Mostly around the "which older CPUs do we leave this on for?" crowd. I have Pentium-M class hardware that I was going to spin up -HEAD on. So I'll go install -HEAD on said older hardware and get a list of what does and doesn't work. I'm totally fine with disabling p4tcc and acpi_throttle if P states for cpu frequency adjustment are available. I just want to ensure that the temperature throttling stuff is going to get automatically engaged (by whichever magical BIOS/ACPI/SMI thing does it) and clock things down if the CPU gets way too hot. -a On 4 May 2014 10:07, Nathan Whitehorn wrote: > On 05/04/14 10:05, Allan Jude wrote: >> >> On 2014-05-04 11:47, Allan Jude wrote: >>> >>> On 2014-05-04 10:28, Matthias Apitz wrote: >>>> >>>> El d=C3=ADa Saturday, May 03, 2014 a las 04:59:48PM -0700, Kevin Oberm= an >>>> escribi=C3=B3: >>>> >>>>> On Sat, May 3, 2014 at 1:25 PM, Adrian Chadd >>>>> wrote: >>>>> >>>>>> Set it to the lowest available Cx state that you see in dev.cpu.0 . >>>>>> >>>>>> >>>>> Available is not required. Set it to C8. That guarantees that you wil= l >>>>> use >>>>> the lowest available. The correct incantation in rc.conf is "Cmax". >>>>> performance_cx_lowest=3D"Cmax" >>>>> economy_cx_lowest=3D"Cmax" >>>>> >>>>> But, unless you want laggy performance, you will probably also want: >>>>> hint.p4tcc.0.disabled=3D1 >>>>> hint.acpi_throttle.0.disabled=3D1 >>>>> in /boot/loader.conf. Low Cx states and TCC/throttling simply don't m= ix >>>>> well and TCC is not effective, as mentioned earlier in this thread. >>>> >>>> Re/ powerd I have in /etc/rc.conf: >>>> >>>> # powerd >>>> powerd_enable=3D"YES" >>>> powerd_flags=3D"-a max -b adp" >>>> # >>>> performance_cx_lowest=3D"Cmax" >>>> economy_cx_lowest=3D"Cmax" >>>> >>>> (and the additional hint.* in /boot/loader.conf as well). Which proces= s >>>> 'performance_cx_lowest' and 'economy_cx_lowest' target exactly as conf= ig >>>> values? >>>> >>>> Thx >>>> >>>> matthias >>>> >>> In a pretty unscientific test on my laptop (Lenovo T530 with Intel i5 >>> 3320M), setting hw.acpi.cpu.cx_lowest=3DC8 lowered power consumption at >>> idle by about 3 watts, which adds about 30-45 minutes to my battery lif= e >>> during conservative usage. >>> >>> Using PCBSD 10, so hint.acpi_throttle.0.disabled=3D1 was already set >>> (apparently solves some issue with powerd on some AMD systems) >>> >>> I have added hint.p4tcc.0.disabled=3D1 but not sure where to expect to = see >>> a difference. >>> >> I see the difference now, with the p4tcc stuff disabled, the lowest >> cpufreq is now 1200mhz instead of 150mhz >> >> > > I just set the default for acpi_throttle and p4tcc in HEAD to disabled by > adding these line to the default /boot/device.hints. If you want them bac= k, > editing your device.hints will restore them. This can be reverted if many > people want throttling enabled by default, but all I have heard so far -- > and for the past many years -- is a unanimous chorus to turn it off. > -Nathan > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= "