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[23.128.96.18]) by mx.google.com with ESMTP id n7si3514874ejx.652.2021.05.27.18.00.00; Thu, 27 May 2021 18:00:26 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234205AbhE1BAa (ORCPT + 99 others); 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.