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[23.128.96.18]) by mx.google.com with ESMTP id ok21si7644497ejb.373.2020.08.24.08.44.08; Mon, 24 Aug 2020 08:44:31 -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 S1728014AbgHXPmf convert rfc822-to-8bit (ORCPT + 99 others); Mon, 24 Aug 2020 11:42:35 -0400 Received: from mga03.intel.com ([134.134.136.65]:4738 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726473AbgHXPj1 (ORCPT ); Mon, 24 Aug 2020 11:39:27 -0400 IronPort-SDR: Wn9zzGXdoQaIbuan1iLH5Ja1D550aM7G/T48IjjAK4ebNw7f+aKWRzsydQhk7mMFzRUMumPVEv zJoJddDux0Og== X-IronPort-AV: E=McAfee;i="6000,8403,9722"; a="155911950" X-IronPort-AV: E=Sophos;i="5.76,349,1592895600"; d="scan'208";a="155911950" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 08:38:59 -0700 IronPort-SDR: OXGKpCExxzOcDnP+9+nDPRBYDX0Rz4GWrLd/kIgqZv6PvbbvIW34Ae6s3iWxcqtqzN9OqskkrV xaBwVtfE/QSw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,349,1592895600"; d="scan'208";a="499513514" Received: from fmsmsx601-2.cps.intel.com (HELO fmsmsx601.amr.corp.intel.com) ([10.18.84.211]) by fmsmga005.fm.intel.com with ESMTP; 24 Aug 2020 08:38:59 -0700 Received: from shsmsx604.ccr.corp.intel.com (10.109.6.214) by fmsmsx601.amr.corp.intel.com (10.18.126.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Mon, 24 Aug 2020 08:38:57 -0700 Received: from fmsmsx610.amr.corp.intel.com (10.18.126.90) by SHSMSX604.ccr.corp.intel.com (10.109.6.214) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Mon, 24 Aug 2020 23:38:55 +0800 Received: from fmsmsx610.amr.corp.intel.com ([10.18.126.90]) by fmsmsx610.amr.corp.intel.com ([10.18.126.90]) with mapi id 15.01.1713.004; Mon, 24 Aug 2020 08:38:53 -0700 From: "Luck, Tony" To: "Tang, Feng" , Borislav Petkov CC: "Chen, Rong A" , LKML , "lkp@lists.01.org" , "Mel Gorman" Subject: RE: [LKP] Re: [x86/mce] 1de08dccd3: will-it-scale.per_process_ops -14.1% regression Thread-Topic: [LKP] Re: [x86/mce] 1de08dccd3: will-it-scale.per_process_ops -14.1% regression Thread-Index: AQHWdTm7eFqn4vHQO0+vfjZnMLG+/6k+S8yAgADZR4CAAyQ1gIAFlB6AgAAFMQD//4tJoA== Date: Mon, 24 Aug 2020 15:38:53 +0000 Message-ID: <6e996ad05e434a6fb13f069ee72b876b@intel.com> References: <20200425114414.GU26573@shao2-debian> <20200425130136.GA28245@zn.tnic> <20200818082943.GA65567@shbuild999.sh.intel.com> <20200818200654.GA21494@agluck-desk2.amr.corp.intel.com> <20200819020437.GA2605@shbuild999.sh.intel.com> <20200821020259.GA90000@shbuild999.sh.intel.com> <20200824151425.GF4794@zn.tnic> <20200824153300.GA56944@shbuild999.sh.intel.com> In-Reply-To: <20200824153300.GA56944@shbuild999.sh.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 x-originating-ip: [10.22.254.132] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Yes, that's what we suspected. And I just did another try to force the > percpu mce structure aligned. And the regression seems to be gone (reduced > from 14.1% to 2%), which further proved it. I wonder whether it would be useful for bisection of performance issues for you to change the global definition of DEFINE_PER_CPU() to make all per CPU definitions aligned. Just like you switch compiler flags to make all functions aligned. -Tony