Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753874AbcDYJSu (ORCPT ); Mon, 25 Apr 2016 05:18:50 -0400 Received: from mail-wm0-f53.google.com ([74.125.82.53]:37155 "EHLO mail-wm0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753533AbcDYJSt (ORCPT ); Mon, 25 Apr 2016 05:18:49 -0400 Message-ID: <1461575925.3670.25.camel@gmail.com> Subject: Re: [RFC] The Linux Scheduler: a Decade of Wasted Cores Report From: Mike Galbraith To: Brendan Gregg , Jeff Merkey Cc: LKML , Peter Zijlstra Date: Mon, 25 Apr 2016 11:18:45 +0200 In-Reply-To: <1461481517.3835.125.camel@gmail.com> References: <1461481517.3835.125.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.16.5 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 Content-Length: 910 Lines: 27 On Sun, 2016-04-24 at 09:05 +0200, Mike Galbraith wrote: > On Sat, 2016-04-23 at 18:38 -0700, Brendan Gregg wrote: > > > The bugs they found seem real, and their analysis is great (although > > using visualizations to find and fix scheduler bugs isn't new), and it > > would be good to see these fixed. However, it would also be useful to > > double check how widespread these issues really are. I suspect many on > > this list can test these patches in different environments. > > Part of it sounded to me very much like they're meeting and "fixing" > SMP group fairness... Ew, NUMA boxen look like they could use a hug or two. Add a group of one hog to compete with a box wide kbuild, ~lose a node. Master.today, 4 node box, make -j 192 modules root group real 1m6.987s 1.00 cgroup vs 1 group of 1 hog real 1m20.871s 1.20 cgroup vs 2 groups of 1 hog real 1m48.803s 1.62 -Mike