From owner-freebsd-stable@freebsd.org Mon Aug 14 03:28:04 2017 Return-Path: Delivered-To: freebsd-stable@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 5499FDCE3E2 for ; Mon, 14 Aug 2017 03:28:04 +0000 (UTC) (envelope-from prvs=03993fbaa3=ari@ish.com.au) Received: from fish.ish.com.au (ip-2.ish.com.au [203.29.62.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 1FE896A272 for ; Mon, 14 Aug 2017 03:28:03 +0000 (UTC) (envelope-from prvs=03993fbaa3=ari@ish.com.au) Received: from ip-136.ish.com.au ([203.29.62.136]:63740) by fish.ish.com.au with esmtpsa (TLSv1.2:AES128-SHA:128) (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1dh60Z-0004tb-0K for freebsd-stable@freebsd.org; Mon, 14 Aug 2017 13:25:39 +1000 X-CTCH-RefID: str=0001.0A150203.59911833.0048:SCFSTAT42589845, ss=1, re=-4.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 To: freebsd-stable From: Aristedes Maniatis Subject: TSC timekeeping and cpu states Message-ID: Date: Mon, 14 Aug 2017 13:25:38 +1000 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:56.0) Gecko/20100101 Thunderbird/56.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-AU Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Aug 2017 03:28:04 -0000 I note that in FreeBSD 11, we now have this: # grep performance_cx_lowest /etc/defaults/rc.conf performance_cx_lowest="C2" # Online CPU idle state However this wiki page suggests that C1 is the default https://wiki.freebsd.org/TuningPowerConsumption Are these inconsistent? I went looking for this because I've been having trouble with the TSC-low timecounter hardware choice and my system clock running at about 80% of normal speed. Moving to ACPI-fast solved this problem. Could the power saving CPU states be related to this problem, or should I look elsewhere for the TSC issue? This is a server, not a laptop. Thanks Ari -- --------------------------> Aristedes Maniatis CEO, ish https://www.ish.com.au GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A