From owner-freebsd-hackers@FreeBSD.ORG Sun Mar 6 09:29:44 2011 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D8813106566B for ; Sun, 6 Mar 2011 09:29:44 +0000 (UTC) (envelope-from martin.birgmeier@aon.at) Received: from email.aon.at (nat-warsl417-01.aon.at [195.3.96.119]) by mx1.freebsd.org (Postfix) with ESMTP id 393A78FC0C for ; Sun, 6 Mar 2011 09:29:43 +0000 (UTC) Received: (qmail 23047 invoked from network); 6 Mar 2011 09:03:03 -0000 Received: from smarthub95.highway.telekom.at (HELO email.aon.at) ([172.18.5.234]) (envelope-sender ) by fallback43.highway.telekom.at (qmail-ldap-1.03) with SMTP for ; 6 Mar 2011 09:03:03 -0000 Received: (qmail 31909 invoked from network); 6 Mar 2011 09:03:00 -0000 X-Spam-Checker-Version: SpamAssassin 3.2.0 (2007-05-01) on WARSBL503.highway.telekom.at X-Spam-Level: Received: from 188-23-212-212.adsl.highway.telekom.at (HELO gandalf.xyzzy) ([188.23.212.212]) (envelope-sender ) by smarthub95.highway.telekom.at (qmail-ldap-1.03) with SMTP for ; 6 Mar 2011 09:03:00 -0000 Received: from atpcdvvc.xyzzy (atpcdvvc.xyzzy [IPv6:fec0:0:0:4d42::84]) by gandalf.xyzzy (8.14.4/8.14.4) with ESMTP id p2692xdm007453 for ; Sun, 6 Mar 2011 10:03:00 +0100 (CET) (envelope-from martin.birgmeier@aon.at) Message-ID: <4D734DC3.3050709@aon.at> Date: Sun, 06 Mar 2011 10:02:59 +0100 From: Martin Birgmeier User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.9.2.15) Gecko/20110305 Thunderbird/3.1.9 MIME-Version: 1.0 To: freebsd-hackers@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Sun, 06 Mar 2011 12:13:49 +0000 Subject: All CPUs always running at profhz X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Mar 2011 09:29:44 -0000 I have systems running 7.4 and 8.2. The newer ones (in terms of age of hardware) are always running at profhz, i.e., when executing a "systat -vm 1" I see that all cores always get profhz interrupts per second. An older machine running 7.4 is running at hz (which for this machine I set to kern.hz=200 in loader.conf). Using ps -o ...,flags,... I see that no process has profiling turned on. Why is this so? Especially on laptops, I'd like to save power by lowering the interrupt rate. Regards, Martin -- Martin Birgmeier Vienna Austria