From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757022Ab2IMIqB (ORCPT ); Thu, 13 Sep 2012 04:46:01 -0400 Received: from casper.infradead.org ([85.118.1.10]:40255 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752068Ab2IMIpz convert rfc822-to-8bit (ORCPT ); Thu, 13 Sep 2012 04:45:55 -0400 Message-ID: <1347525949.15764.109.camel@twins> Subject: Re: [RFC] sched: nohz_idle_balance From: Peter Zijlstra To: Vincent Guittot Cc: Mike Galbraith , linux-kernel@vger.kernel.org, linaro-dev@lists.linaro.org, mingo@redhat.com, Venkatesh Pallipadi , Suresh Siddha Date: Thu, 13 Sep 2012 10:45:49 +0200 In-Reply-To: References: <1347509486-8688-1-git-send-email-vincent.guittot@linaro.org> <1347518991.6821.45.camel@marge.simpson.net> <1347521382.6821.61.camel@marge.simpson.net> <1347522994.6821.67.camel@marge.simpson.net> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2012-09-13 at 10:37 +0200, Vincent Guittot wrote: > > I think you need to present numbers showing benefit. Crawling all over > > a mostly idle (4096p?) box is decidedly bad thing to do. Yeah, but we're already doing that anyway.. we know nohz idle balance doesn't scale. Venki and Suresh were working on that, but with Venki switching jobs this work got dropped. I did talk to Suresh about it a week or so ago.. I think he was going to look at it again.