From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758562Ab1F1PBG (ORCPT ); Tue, 28 Jun 2011 11:01:06 -0400 Received: from casper.infradead.org ([85.118.1.10]:44611 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758556Ab1F1PAi convert rfc822-to-8bit (ORCPT ); Tue, 28 Jun 2011 11:00:38 -0400 Subject: Re: power increase issue on light load From: Peter Zijlstra To: "Alex,Shi" Cc: "ncrao@google.com" , "mingo@elte.hu" , "Chen, Tim C" , "Li, Shaohua" , "linux-kernel@vger.kernel.org" , len.brown@intel.com In-Reply-To: <1309219329.14604.11.camel@debian> References: <1308797024.23204.95.camel@debian> <1308819748.1022.69.camel@twins> <1308876099.23204.124.camel@debian> <1309219329.14604.11.camel@debian> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Tue, 28 Jun 2011 16:59:40 +0200 Message-ID: <1309273180.6701.213.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2011-06-28 at 08:02 +0800, Alex,Shi wrote: > > > > > > What happens if you try something like the below. Increased imbalance > > > might lead to more load-balance action, which might lead to more task > > > migration/waking up of cpus etc. > > > > > > If the below makes any difference, Nikhil's changes have a funny that > > > needs to be caught. > > > > Yes, it most remove the commit effect, So the power recovered. > > > > In fact the only suspicious I found is large imbalance, but that is > > the commit want ... > > Any further comments for this? I had a look over all that stuff, but I couldn't find an obvious unit mis-match in any of the imbalance code. Nikhil any clue?