Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753154Ab0BUUfe (ORCPT ); Sun, 21 Feb 2010 15:35:34 -0500 Received: from ogre.sisk.pl ([217.79.144.158]:58395 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751977Ab0BUUfa (ORCPT ); Sun, 21 Feb 2010 15:35:30 -0500 From: "Rafael J. Wysocki" To: Guennadi Liakhovetski Subject: What's the right value for idle= (was: Re: [linux-pm] regression on P-II SMP) Date: Sun, 21 Feb 2010 21:36:03 +0100 User-Agent: KMail/1.12.4 (Linux/2.6.33-rc8-rjw; KDE/4.3.5; x86_64; ; ) Cc: linux-pm@lists.linux-foundation.org, LKML , ACPI Devel Maling List , Venki Pallipadi , Len Brown , Arjan van de Ven References: In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201002212136.03783.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1348 Lines: 25 On Sunday 21 February 2010, Guennadi Liakhovetski wrote: > Hi > > my 2xP-II@400MHz locks up with 2.6.32(.X) unless I specify "idle=*" on the > kernel command-line, where "*" is one of "poll," "mwait," "halt," and only > "nomwait" indeed locks it up. Last kernel known to work was 2.6.25. So, it > doesn't bother me all that much - I have a way to boot it, but maybe > someone would be interested to fix this (this system already has a few > quirks on the kernel command line, so, one more doesn't really hurt;)). > What interests me more - which of those shall I be using? From > Documentation/kernel-parameters.txt it looks like "mwait" should be best > for me? Or should I be using "halt?" "Poll" does indeed fry CPUs - raises > sys temperatures to 50 / 60 degrees C. Power-saving is not that much of a > concern for me - I only run that system occasionally, but it shouldn't > produce more heat than it must;) And since this system does have a broken > ACPI (Compaq AP400), I wouldn't try to be too smart with it. I guess "mwait" is the right one, but let's try to ask experts. Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/