From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755582AbcEYQZF (ORCPT ); Wed, 25 May 2016 12:25:05 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:40635 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752237AbcEYQY5 (ORCPT ); Wed, 25 May 2016 12:24:57 -0400 Date: Wed, 25 May 2016 18:24:49 +0200 From: Peter Zijlstra To: Chris Mason , mingo@kernel.org, linux-kernel@vger.kernel.org, matt@codeblueprint.co.uk, mgalbraith@suse.de, tglx@linutronix.de, fweisbec@gmail.com Subject: Re: [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Message-ID: <20160525162449.GW3193@twins.programming.kicks-ass.net> References: <20160509104807.284575300@infradead.org> <20160525145120.zw4wxb3auiwiq3tm@floor.thefacebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160525145120.zw4wxb3auiwiq3tm@floor.thefacebook.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 25, 2016 at 10:51:20AM -0400, Chris Mason wrote: > On Mon, May 09, 2016 at 12:48:07PM +0200, Peter Zijlstra wrote: > > Hai, > > > > here be a semi coherent patch series for the recent select_idle_siblings() > > tinkering. Happy benchmarking.. > > This took a while, mostly because my original schbench showed your > patches were just as fast as our internal patch, but our production > benchmark showed a 5-10% regression. My theory was just that schbench > wasn't fine grained enough, and the load would stop before the > regression kicked in. Just to be sure; regression as per your production kernel, not vs. mainline, right?