From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754154AbcEBO6b (ORCPT ); Mon, 2 May 2016 10:58:31 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:57969 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753144AbcEBO6W (ORCPT ); Mon, 2 May 2016 10:58:22 -0400 Date: Mon, 2 May 2016 16:58:17 +0200 From: Peter Zijlstra To: Mike Galbraith Cc: Chris Mason , Ingo Molnar , Matt Fleming , linux-kernel@vger.kernel.org Subject: Re: sched: tweak select_idle_sibling to look for idle threads Message-ID: <20160502145817.GW3408@twins.programming.kicks-ass.net> References: <20160405180822.tjtyyc3qh4leflfj@floor.thefacebook.com> <20160409190554.honue3gtian2p6vr@floor.thefacebook.com> <20160430124731.GE2975@worktop.cust.blueprintrf.com> <1462086753.9717.29.camel@suse.de> <20160502084615.GB3430@twins.programming.kicks-ass.net> <1462200604.3736.42.camel@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1462200604.3736.42.camel@suse.de> 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 Mon, May 02, 2016 at 04:50:04PM +0200, Mike Galbraith wrote: > Oh btw, did you know single socket boxen have no sd_busy? That doesn't > look right. I suspected; didn't bother looking at yet. The 'problem' is that the LLC domain is the top-most, so it doesn't have a parent domain. I'm sure we can come up with something if we can get this all working right. And yes, I can get gains on various workloads with various options, I can even break all workloads, but I've so far completely failed on getting a win for everyone :/ In particular low count sysbench-psql (oltp test) vs tbench client==nr_cores is having me flummoxed for a bit.