From owner-freebsd-current@FreeBSD.ORG Thu Mar 27 22:54:53 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3FB9B37B401 for ; Thu, 27 Mar 2003 22:54:53 -0800 (PST) Received: from harmony.village.org (rover.bsdimp.com [204.144.255.66]) by mx1.FreeBSD.org (Postfix) with ESMTP id 744E843F93 for ; Thu, 27 Mar 2003 22:54:52 -0800 (PST) (envelope-from imp@bsdimp.com) Received: from localhost (warner@rover2.village.org [10.0.0.1]) by harmony.village.org (8.12.8/8.12.3) with ESMTP id h2S6slA7099909; Thu, 27 Mar 2003 23:54:47 -0700 (MST) (envelope-from imp@bsdimp.com) Date: Thu, 27 Mar 2003 23:54:28 -0700 (MST) Message-Id: <20030327.235428.101835830.imp@bsdimp.com> To: kris@obsecurity.org From: "M. Warner Losh" In-Reply-To: <20030328043524.GA18639@rot13.obsecurity.org> References: <20030324212040.GF2462@rot13.obsecurity.org> <20030328043524.GA18639@rot13.obsecurity.org> X-Mailer: Mew version 2.1 on Emacs 21.2 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Status: No, hits=-10.2 required=5.0 tests=AWL,IN_REP_TO,REFERENCES autolearn=ham version=2.50 X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.50 (1.173-2003-02-20-exp) cc: current@freebsd.org Subject: Re: ACPI using too much CPU on idle system X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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: Fri, 28 Mar 2003 06:54:54 -0000 In message: <20030328043524.GA18639@rot13.obsecurity.org> Kris Kennaway writes: : On Mon, Mar 24, 2003 at 01:20:40PM -0800, Kris Kennaway wrote: : > top -S shows the following on my machine: : > : > CPU states: 0.8% user, 0.0% nice, 80.3% system, 12.9% interrupt, 6.1% idle : > : > PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND : > 11 root -16 0 0K 12K RUN 563:23 32.23% 32.23% idle : > 7 root -84 0 0K 12K actask 1:33 18.51% 18.51% acpi_task2 : > 5 root -84 0 0K 12K actask 1:33 18.21% 18.21% acpi_task0 : > 6 root -84 0 0K 12K actask 1:33 17.82% 17.82% acpi_task1 : > 21 root -68 -187 0K 12K WAIT 0:55 4.98% 4.98% irq9: fxp0 atapci0* : > 17 root -24 -143 0K 12K WAIT 0:06 0.83% 0.83% swi6: acpitaskq : > : > The machine is supposedly idle..no process, disk or network activity, : > so I can't see any reason for all this kernel CPU activity. What is : > going on? Is this some kind of software-emulated CPU step-down : > because ACPI has decided my CPU is too fast? :) : : Hello, ACPI people? I haven't had any response to this yet. I've seen this on a dying battery on my Dell i8000. From time to time, it just eats lots of CPU trying to get the battery's status. Could also be a defective battery bay. But I see very similar results. Warner