From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753953AbbE1MPP (ORCPT ); Thu, 28 May 2015 08:15:15 -0400 Received: from smtp.nue.novell.com ([195.135.221.5]:34100 "EHLO smtp.nue.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752201AbbE1MPH (ORCPT ); Thu, 28 May 2015 08:15:07 -0400 Message-ID: <1432815303.3237.156.camel@novell.com> Subject: Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for BALANCE_WAKE From: Mike Galbraith To: Ingo Molnar Cc: Peter Zijlstra , Josef Bacik , riel@redhat.com, mingo@redhat.com, linux-kernel@vger.kernel.org Date: Thu, 28 May 2015 14:15:03 +0200 In-Reply-To: <20150528114912.GA29228@gmail.com> References: <1432761736-22093-1-git-send-email-jbacik@fb.com> <20150528102127.GD3644@twins.programming.kicks-ass.net> <1432811789.3237.138.camel@novell.com> <20150528114912.GA29228@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2015-05-28 at 13:49 +0200, Ingo Molnar wrote: > * Mike Galbraith wrote: > > > On Thu, 2015-05-28 at 12:21 +0200, Peter Zijlstra wrote: > > > > > In fact, select_idle_sibling() is already too expensive on current > > > server hardware (far too damn many cpus in a LLC domain). > > > > Yup. I've played with rate limiting motion per task because of that. > > Packages have gotten way too damn big. > > What's the biggest you've seen? 15 cores so far. It'll no doubt grow. -Mike