From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Pallipadi, Venkatesh" Subject: Re: [BUG][2.6.30] Niced processes do not raise CPU frequency with ondemand Date: Fri, 12 Jun 2009 10:41:48 -0700 Message-ID: <1244828508.4534.1404.camel@localhost.localdomain> References: <200906121844.02004.elendil@planet.nl> <1244825317.4534.1342.camel@localhost.localdomain> <200906121925.38693.elendil@planet.nl> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com ([134.134.136.20]:28987 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751834AbZFLRnV (ORCPT ); Fri, 12 Jun 2009 13:43:21 -0400 In-Reply-To: <200906121925.38693.elendil@planet.nl> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Frans Pop Cc: "linux-kernel@vger.kernel.org" , "linux-acpi@vger.kernel.org" On Fri, 2009-06-12 at 10:25 -0700, Frans Pop wrote: > Thanks for the quick reply Venki. > > On Friday 12 June 2009, Pallipadi, Venkatesh wrote: > > What does ignore_nice under cpufreq/ondemand say? > > Right, that's 1 (was not aware that existed :-P) > And changing it to 0 solves the problem. OK. Good to know that there are no kernel bugs with honoring ignore_nice_load setting. :) > Next question is: how and why does it get set? > As userland has not changed (AFAIK), my first suspect remains the kernel. > Kernel never sets this. It is initialized to 0 and provides a /sys interface to user. I think it is set by some user app (gnome-power-manager or some other app like that). That explains why it is 0 initially after boot and gets changed later. The support for ignore_nice_load=1 was broken in kernel for a short while (arounf 2.6.28, IIRC). That may be the reason why this behavior was not noticed earlier. Thanks, Venki