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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 433B6C4708A for ; Fri, 28 May 2021 00:59:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1BC76613BF for ; Fri, 28 May 2021 00:59:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234510AbhE1BAa (ORCPT ); Thu, 27 May 2021 21:00:30 -0400 Received: from mga03.intel.com ([134.134.136.65]:39044 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229843AbhE1BA3 (ORCPT ); Thu, 27 May 2021 21:00:29 -0400 IronPort-SDR: rNCe4A8iK7RZ4oT2apTMCInuEXrE1rUi1dVa//cTZgNZziny9yQTCkztPrb+1gRHkhk/JwiNef H3EosxDRd7Gw== X-IronPort-AV: E=McAfee;i="6200,9189,9997"; a="202904457" X-IronPort-AV: E=Sophos;i="5.83,228,1616482800"; d="scan'208";a="202904457" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 17:58:55 -0700 IronPort-SDR: izcikGdFV1LtOs5sI0F18rj7l/4fqxxuLlLpDvbMi4KFrDxpo7zWFQa6qg/K8Vw5qIW8Q7abjz sX7BWllJUXpA== X-IronPort-AV: E=Sophos;i="5.83,228,1616482800"; d="scan'208";a="548379223" Received: from akleen-mobl1.amr.corp.intel.com (HELO [10.252.135.183]) ([10.252.135.183]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 17:58:53 -0700 Subject: Re: [clocksource] 8901ecc231: stress-ng.lockbus.ops_per_sec -9.5% regression To: paulmck@kernel.org, Matthew Wilcox Cc: Feng Tang , kernel test robot , John Stultz , Thomas Gleixner , Stephen Boyd , Jonathan Corbet , Mark Rutland , Marc Zyngier , Xing Zhengjun , Chris Mason , LKML , Linux Memory Management List , lkp@lists.01.org, lkp@intel.com, ying.huang@intel.com, zhengjun.xing@intel.com References: <20210521083322.GG25531@xsang-OptiPlex-9020> <20210521135617.GT4441@paulmck-ThinkPad-P17-Gen-1> <20210522160827.GA2625834@paulmck-ThinkPad-P17-Gen-1> <20210526064922.GD5262@shbuild999.sh.intel.com> <20210526134911.GB4441@paulmck-ThinkPad-P17-Gen-1> <20210527182959.GA437082@paulmck-ThinkPad-P17-Gen-1> <138f81df-08e1-f96e-1915-c58b44f96a41@linux.intel.com> <20210527191923.GD4397@paulmck-ThinkPad-P17-Gen-1> <20210527210524.GE4397@paulmck-ThinkPad-P17-Gen-1> From: Andi Kleen Message-ID: <7bda8e6a-2179-b431-973b-d074cd8d93db@linux.intel.com> Date: Thu, 27 May 2021 17:58:53 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: <20210527210524.GE4397@paulmck-ThinkPad-P17-Gen-1> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Only those cloud provides making heavy use of the aforementioned "poorly > designed" hardware, correct? If any such hardware is deployed in non homeopathic quantities, we probably need to support it out of the box. So far I'm not seeing any evidence that it does not. That would argue for including the patch in the patch series. Especially since stress-ng is somewhat popular for system testing.