From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756182AbZFRBCn (ORCPT ); Wed, 17 Jun 2009 21:02:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753960AbZFRBCf (ORCPT ); Wed, 17 Jun 2009 21:02:35 -0400 Received: from main.gmane.org ([80.91.229.2]:56348 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751780AbZFRBCe (ORCPT ); Wed, 17 Jun 2009 21:02:34 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Jason Lynch Subject: Re: [BUG?,FEATURE?] One core idles with 4 nice and 1 regular process Date: Thu, 18 Jun 2009 01:02:21 +0000 (UTC) Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 207-118-117-152.dyn.centurytel.net User-Agent: Pan/0.133 (House of Butterflies) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 16 Jun 2009 19:09:59 +0000, Jason Lynch wrote: > If I can provide any additional information to help, I'll be happy to > oblige. I discovered a post on lkml from last October, wherein a user reports what sounds like the same issue on 2.6.25.9. http://article.gmane.org/gmane.linux.kernel/748316/ In addition, Ubuntu's current 2.6.28 kernel appears to be immune from the problem, suggesting a possible configuration issue, or at least an option that can trigger/avoid the problem. However, comparing the configs is difficult due to the number of added, changed, and removed options between kernel versions. The differences that stood out in my initial comparisons were CONFIG_RT_GROUP_SCHED and CONFIG_CPUSETS, but I haven't yet had an opportunity to test either of them, and neither sounds especially promising. I won't personally be able to do any more extensive kernel testing for perhaps a couple of weeks. However, if this is merely a configuration issue, it seems rather opaque to me, as I can't imagine this behavior being desirable in any case.