From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751998AbcFVLN3 (ORCPT ); Wed, 22 Jun 2016 07:13:29 -0400 Received: from merlin.infradead.org ([205.233.59.134]:47264 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751175AbcFVLN0 (ORCPT ); Wed, 22 Jun 2016 07:13:26 -0400 Date: Wed, 22 Jun 2016 13:12:46 +0200 From: Peter Zijlstra To: Jirka Hladky Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Kamil Kolakowski Subject: Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel Message-ID: <20160622111246.GE30154@twins.programming.kicks-ass.net> References: <20160616172256.GJ30921@twins.programming.kicks-ass.net> <20160622071601.GX30154@twins.programming.kicks-ass.net> <20160622074941.GV30927@twins.programming.kicks-ass.net> <20160622075445.GW30927@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 22, 2016 at 11:52:45AM +0200, Jirka Hladky wrote: > Hi Peter, > > the performance regression has been caused by this commit > > ================================================= > commit 6ecdd74962f246dfe8750b7bea481a1c0816315d > Author: Yuyang Du > Date: Tue Apr 5 12:12:26 2016 +0800 > > sched/fair: Generalize the load/util averages resolution definition > ================================================= > > Could you please have a look? That patch looks like a NO-OP to me. In any case, the good news it that I can run the benchmark, the bad news is that the patch you fingered doesn't appear to be it. v4.60: ./4.6.0/2016-Jun-22_11h11m07s.log:Score on xml.transform: 2007.18 ops/m ./4.6.0/2016-Jun-22_11h11m07s.log:Score on xml.validation: 2999.44 ops/m tip/master: ./4.7.0-rc4-00345-gf6e78bb/2016-Jun-22_11h30m27s.log:Score on xml.transform: 1283.14 ops/m ./4.7.0-rc4-00345-gf6e78bb/2016-Jun-22_11h30m27s.log:Score on xml.validation: 2008.62 ops/m patch^1 ./4.6.0-rc5-00034-g2159197/2016-Jun-22_12h38m50s.log:Score on xml.transform: 1196.18 ops/m ./4.6.0-rc5-00034-g2159197/2016-Jun-22_12h38m50s.log:Score on xml.validation: 2055.11 ops/m patch^1 + patch ./4.6.0-rc5-00034-g2159197-dirty/2016-Jun-22_12h55m43s.log:Score on xml.transform: 1294.59 ops/m ./4.6.0-rc5-00034-g2159197-dirty/2016-Jun-22_12h55m43s.log:Score on xml.validation: 2140.02 ops/m