From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frans Pop Subject: Re: [BUG][2.6.30] Niced processes do not raise CPU frequency with ondemand Date: Fri, 12 Jun 2009 20:05:02 +0200 Message-ID: <200906122005.02965.elendil@planet.nl> References: <200906121844.02004.elendil@planet.nl> <200906121925.38693.elendil@planet.nl> <1244828508.4534.1404.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Received: from cpsmtpm-eml102.kpnxchange.com ([195.121.3.6]:64603 "EHLO CPSMTPM-EML102.kpnxchange.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758844AbZFLSFC (ORCPT ); Fri, 12 Jun 2009 14:05:02 -0400 In-Reply-To: <1244828508.4534.1404.camel@localhost.localdomain> Content-Disposition: inline Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Pallipadi, Venkatesh" Cc: "linux-kernel@vger.kernel.org" , "linux-acpi@vger.kernel.org" On Friday 12 June 2009, Pallipadi, Venkatesh wrote: > On Fri, 2009-06-12 at 10:25 -0700, Frans Pop wrote: > > 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 for the info. I'll see if I can figure out what's responsible. At least I know where to look now. Cheers, FJP