Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752967AbdI1MgZ (ORCPT ); Thu, 28 Sep 2017 08:36:25 -0400 Received: from merlin.infradead.org ([205.233.59.134]:53390 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751906AbdI1MgX (ORCPT ); Thu, 28 Sep 2017 08:36:23 -0400 Date: Thu, 28 Sep 2017 14:36:18 +0200 From: Peter Zijlstra To: Rik van Riel Cc: Eric Farman , ????????? , LKML , Ingo Molnar , Christian Borntraeger , "KVM-ML (kvm@vger.kernel.org)" , vcaputo@pengaru.com, Matthew Rosato Subject: Re: sysbench throughput degradation in 4.13+ Message-ID: <20170928123618.xn2gklm3uoz4kuzc@hirez.programming.kicks-ass.net> References: <95edafb1-5e9d-8461-db73-bcb002b7ebef@linux.vnet.ibm.com> <50a279d3-84eb-3403-f2f0-854934778037@linux.vnet.ibm.com> <20170922155348.zujigkn3o5eylctn@hirez.programming.kicks-ass.net> <754f5a9f-5332-148d-2631-918fc7a7cfe9@linux.vnet.ibm.com> <20170927093530.s3sgdz2vamc5ka4w@hirez.programming.kicks-ass.net> <20170927135820.61cd077f@cuia.usersys.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170927135820.61cd077f@cuia.usersys.redhat.com> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 402 Lines: 10 On Wed, Sep 27, 2017 at 01:58:20PM -0400, Rik van Riel wrote: > I like the simplicity of your approach! I hope it does not break > stuff like netperf... So the old approach that looks at the weight of the two CPUs behaves slightly better in the overloaded case. On the threads==nr_cpus load points they match fairly evenly. I seem to have misplaced my netperf scripts, but I'll have a play with it.