From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E0B39C433ED for ; Wed, 21 Apr 2021 12:03:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A1FDB61448 for ; Wed, 21 Apr 2021 12:03:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234132AbhDUMEM (ORCPT ); Wed, 21 Apr 2021 08:04:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239357AbhDUMEH (ORCPT ); Wed, 21 Apr 2021 08:04:07 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE369C06174A for ; Wed, 21 Apr 2021 05:03:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=+NSk+az2QosENoII1h0fqE2YODWrKCILNwyXS4ZFhb4=; b=jzAMmu4OHt/dmR5Ru5u7WE3vd0 f8fhGkRvxhl7a3ZHNw8LuwACsVQ7sop0zjD9jdeH1k/2fC0xZqDkZNEinc7Zb4aOlaV7s/GF1gpQZ YCFfWFXd174kt8d17d0U57ddGI7v/mLJ6hiadhowHziMW+TltM6BYQcr78PatCop3/wdEy2SGhkGq VrR6dqPelQFHkLt6XOYC+ch0BXErHOB+4Hq7QN5N6SNNB3MhJGT43BRfsq58LDj1KItwCkNd5dcLV NsIZX5JwgrblpvIq95reCDSbJ8YZexpz+olQ4zg/moS0DAPR9NKW4itlm60Ryzwgj0iPUGkuf2pGc LINWNLnQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1lZBZX-00ELjm-4G; Wed, 21 Apr 2021 12:03:15 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 077EF300130; Wed, 21 Apr 2021 14:03:08 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id E243628582672; Wed, 21 Apr 2021 14:03:08 +0200 (CEST) Date: Wed, 21 Apr 2021 14:03:08 +0200 From: Peter Zijlstra To: Valentin Schneider Cc: Oliver Sang , 0day robot , Vincent Guittot , Dietmar Eggemann , LKML , lkp@lists.01.org, ying.huang@intel.com, feng.tang@intel.com, zhengjun.xing@intel.com, Lingutla Chandrasekhar , Ingo Molnar , Morten Rasmussen , Qais Yousef , Quentin Perret , Pavan Kondeti , Rik van Riel , aubrey.li@linux.intel.com, yu.c.chen@intel.com Subject: Re: [sched/fair] 38ac256d1c: stress-ng.vm-segv.ops_per_sec -13.8% regression Message-ID: References: <20210414052151.GB21236@xsang-OptiPlex-9020> <87im4on5u5.mognet@arm.com> <20210421032022.GA13430@xsang-OptiPlex-9020> <87bla8ue3e.mognet@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87bla8ue3e.mognet@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 21, 2021 at 11:27:49AM +0100, Valentin Schneider wrote: > o 2-socket Xeon E5-2690 (x86, 40 cores) > > and found at worse a -0.3% regression and at best a 2% improvement. I know > that x86 box is somewhat ancient, but it's been my go-to "have I broken > x86?" test victim for a while :-) It happens that my main test-box is an E5-2680. I've got a slightly more modern one too, but that boots like treacle so I end up using the IVB-EP most :-)