From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from SJ2PR03CU001.outbound.protection.outlook.com (mail-westusazon11012008.outbound.protection.outlook.com [52.101.43.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 241D646D08D; Thu, 30 Jul 2026 19:49:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.43.8 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785440967; cv=fail; b=DP6GLIytZ/uotqbuKYrNOWhBXGl3qgTaPZE4aQApDowqaTLek1+5Vp6uOCNWxwdtfltCA74v96gL+7ppKJQjg/+fIoSI0zoSjObi55+ZOhnKx/QeFyXfAHRUb5fnBIXfhgydY9cpjwj49MzfVpJif3uoOpZFLjR2/NOf2EjWcwY= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785440967; c=relaxed/simple; bh=yIUnFAbPkVa8aE0p+jNLX9Ck2ruTjJtnN9LoOV1qiJw=; h=Message-ID:Date:Subject:To:Cc:References:From:In-Reply-To: Content-Type:MIME-Version; b=RIpIN/anr3Jwavzq3DuEBN29b3yU+XFdS6yPnXyMmkVdt6XFsTbJ/mEhqDptlCI9+TYXbwiIAYWlxHYli05ISyKjt8OkALM6uAGU/UsfLPJe486c0xgwNnDjORZdbLkq+Mt0l7of4/vzliVUiraNXf3yRg3IvSQtC0dXAV6LJCE= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=2QEhVumX; arc=fail smtp.client-ip=52.101.43.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="2QEhVumX" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=bpd4PVJgpMKqf6oAff+zfiLIaUyy11wWLxvrrmNgFzlKPAGENn7LNIgumijBKASrTredc9RtLx7Un61Sd2J0fyXFFCfRUHh3UWOIhh6a0kCNds3YXRDGGaPEGPXYPaTue0B+ekTAwTngVwnrmUlZ+mn31mkL1qpHUaVbvcQ1AYaS3mwnBbhoFjPsV32CSIdv8mzuHv4dDLCagyD+mMC6KxcNtjV7VTzE58e8LidrmPINRgzVs5z/ORlUua8p8/24PFIIJXrZtR0I3jC56rxXQHvzqD+bcMtbyJ9Qh0wpkFAA9G4XPhU1tPzWV/XOWZNImDziOWGJ17sjcXjHXgLEdA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=RNfcy9C5SLQSogjMfn5Ys9CQTqenNyYinuEc8UQzysw=; b=QOcnk1oJ9tggmpiCmOt5Sl5aueoOFGhDHL9+CXUquJVbDGHdDHc8jmn+dwapQQJoTu/leieyjUKoXWK/+c3+/DVSzZA1WZnSIIS2W8G8q/jdfaopSneOHfDsIktGSo6wJ59HcvfAQqFH1eB16VvT6gjkjFPqeFejxcis/QVbo5KvDpFso+yJt05iTiyKg/z6C4t4IXOTuAYg0X/yFb/oMWUBh7GxStWZmhihzHQA/t7yCeSLG41gY3AJnoKb+txq7oD+Z8urYWoPrvV0AN9hiceZ/8eeG1s1Nh2uqfCa1IMedWzDR6cXu0StAB+29HOOyRop/dKpSfvd1W4FQ5pKbA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=RNfcy9C5SLQSogjMfn5Ys9CQTqenNyYinuEc8UQzysw=; b=2QEhVumXsDE8hUzbmYa4YitAhCGKVeboT/DfNL/QxsXmqxaIC5AqHuAS3JX/FSjeo5eO6wTSrwYlUyfBFNqzQetx5XwFt4NBv060bthwEU/BeBdpktEj5DwBvYWDKCZcqkj1el7XXN0lso5a6IfmVVSRAKtPxeH649T2vkYT1Vk= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from BL1PR12MB5320.namprd12.prod.outlook.com (2603:10b6:208:314::17) by PH8PR12MB8431.namprd12.prod.outlook.com (2603:10b6:510:25a::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.245.13; Thu, 30 Jul 2026 19:49:08 +0000 Received: from BL1PR12MB5320.namprd12.prod.outlook.com ([fe80::1876:4a6d:2cf5:b8d1]) by BL1PR12MB5320.namprd12.prod.outlook.com ([fe80::1876:4a6d:2cf5:b8d1%5]) with mapi id 15.21.0270.012; Thu, 30 Jul 2026 19:49:07 +0000 Message-ID: Date: Thu, 30 Jul 2026 14:49:05 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] x86/resctrl, Documentation: Keep mbm_assign_mode "default" on boot To: Borislav Petkov Cc: "Moger, Babu" , Reinette Chatre , "Luck, Tony" , "x86@kernel.org" , "Dave.Martin@arm.com" , "james.morse@arm.com" , "corbet@lwn.net" , "skhan@linuxfoundation.org" , "tglx@kernel.org" , "mingo@redhat.com" , "dave.hansen@linux.intel.com" , "hpa@zytor.com" , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "Eranian, Stephane" , "peternewman@google.com" References: <20260728191818.GBamkAeh7BD1d6Gd8X@fat_crate.local> <2c098892-5d4b-402b-bdfb-59e3bf164c8d@amd.com> <73737438-01ed-437e-846a-5aa8bd687462@amd.com> <7495c998-4f3f-4ea5-a383-350584afb42c@amd.com> <6d006c4c-907a-435f-ac94-32974562ce2d@intel.com> <20260730184626.GIamucAtZxMUUGagGm@fat_crate.local> <7d3dd384-9101-49cb-ada4-b8320198233e@amd.com> <20260730194328.GEamupYLsURg6VvxBU@fat_crate.local> Content-Language: en-US From: Babu Moger In-Reply-To: <20260730194328.GEamupYLsURg6VvxBU@fat_crate.local> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: CH0PR03CA0246.namprd03.prod.outlook.com (2603:10b6:610:e5::11) To BL1PR12MB5320.namprd12.prod.outlook.com (2603:10b6:208:314::17) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL1PR12MB5320:EE_|PH8PR12MB8431:EE_ X-MS-Office365-Filtering-Correlation-Id: 0c00f19c-8408-42b4-796b-08deee739e37 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|7416014|376014|366016|56012099006|4143699003|10067099003|11063799006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL1PR12MB5320.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(23010399003)(1800799024)(7416014)(376014)(366016)(56012099006)(4143699003)(10067099003)(11063799006)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?aTdtVHRlc2VBM1BOYktrV1h2TFg2NUxBOEorZ2MydDYzeWNPVU5vTFdmWTNC?= =?utf-8?B?WnVDeHlCQVdreEVsa0RIdm5GTURkM3ZXU2RRWGl4Z0FxNVZiSHdDWHQxbVRa?= =?utf-8?B?OXhZWWVicGw0TmYzSW1YbGJON05CRFJSMUtQUDlvcWRqL3lLZ1RsOTU3L0Vs?= =?utf-8?B?OWl0MDF4VDV4K2FqV05TUy92WGlYRU9QK0V3OEZ1Zm5qUTFDNkZpdXozd29i?= =?utf-8?B?SW5nSG1QS3dRaUFBc1BQQ3k0REI0RTZtUWhVZGpOWTNZRWJEVzVMc1A0NEhU?= =?utf-8?B?d0ovWmZDY1V1aUpuMmlhaTJPU0ZXSVZqOUJQbzZJT2xpNkhkUW0rdFNWbVlE?= =?utf-8?B?YXZ0WVJVTXBOQk13N0ZUNUg5SzlYazVWeWhJYmRseTF4RERrL3liVkNCbEJY?= =?utf-8?B?UU1Kck1MbkhVTXRCS001czdodUduYXVHcXlOMkd4bG42SzJxbTJWMG1vTm1o?= =?utf-8?B?QjdobnBrQkZxTXNnelV4K1VtaHVOZ0k4TVowaHBHdDVXNE1obkx6cFRlWHc4?= =?utf-8?B?bXdxalBOaklSdk5XcWdoSGpuYTk0SGlpWEYrc0dEcE5idUlCZzMwa1BUSll5?= =?utf-8?B?amxDTXUvd3dsV0Q4QjlEc0JmaDcwZzdQRW1kVjZGODFUWTI0Q2YrdUFoUWtW?= =?utf-8?B?TE9hN2ZzZDB2UWZRT3RSK2RXRUJBU1lxWGgzRm1LdFNIc3BscWljNlp5VzRU?= =?utf-8?B?MjBVUG4rL0RXNEdaNGNJOWs5SWc3c3RJWllBYlA5anFNcFVQejhrZ2hUQWtm?= =?utf-8?B?ZnlrZVUrMlZXcW84cm1vd2Q3eStUMXVuSFhsWVlpMEQ2dGp1V3YySksvZ2R3?= =?utf-8?B?WG1wc1I5dU0yUk5LNEY5SEYyUno4Qk1JaktZeW5lRlkyK2E3OFhyL013N2ZP?= =?utf-8?B?YW8wZzZwSkRua0N0TTA0d1FLdE5zZFo2cEUyaTB1Q0NGaFdYZVRpM3FoZVB3?= =?utf-8?B?dkFRNFVMSEN0TVJWcXVUWGQ4Rzl6dFEyYUprMFkzNHp2ZS9NMzZwRzBsc1ZP?= =?utf-8?B?V0VSR1NGcG12cFFjQjkzMTEyYXAzenY4Mk5SeHFkZit4SEcvanNtK0FRelZm?= =?utf-8?B?L0tvR0JFOSttSFJodStXcjYxVy9pR2poSk1Yd0dHWkNpZDhrTmtPRVhia0Z1?= =?utf-8?B?VlJCd2R4blRTNmhpbkFuYkxtQkF2SmpxdmJjSWh3Si9Qc1dCb0lWeGRRUzhF?= =?utf-8?B?QlliZjBVM2JzWmlUOUgxbVhPTlI1WFNETmNTeG1rOHEwTWtHUWIvNFRXRWll?= =?utf-8?B?RVFVRXkzaUltRFhUaC9hVlRrSTVZL0Z2QWw0Y0VlTGRrV0Z1UFlBNjBoSCtx?= =?utf-8?B?VCtHanVYOEJ5dDBseFhIc0t4QmlsWlI5QVBFZHF5OTcybEZSZzZES2hISE5o?= =?utf-8?B?NmtCVGhKVHdHWktpTnVjNWVsSTZ6OWIvd1c5ejRqY0lQU0krOFowMDhMcnUv?= =?utf-8?B?c3MrUm1FS3grKzJEWVJ6OGtSNUpseDBSeU9LVlhDbHc1TW9hZ2NTc3Q2cDJi?= =?utf-8?B?dVRrendWWTJEV3dwSXRib0J1VHZnUXRSTThPWmhNeDNKKzFFOCtrQzVUZVBo?= =?utf-8?B?Q2JsME1uVUtCRVdMOGl2M1BiQTlvTHczVllHTHhqRDQ5RmNJdVd2SVRkbGpq?= =?utf-8?B?a1BCRUJYbzZjemtRREhLRVZFWGNhYWcwWHBlTWMvK0R2WjJWdlRNeklkOXVl?= =?utf-8?B?Ty9kcEpRVkRpbGJLVnB4SnJ2TDdlRVFSelZwaWtPak9IcU5McHlDSmYwUkhX?= =?utf-8?B?S1VxUDExYUZiYzlKV1l6NWo0S2ZKVDM1NG1lNnhxK1ZKRmlNQ1d2YnFENlNS?= =?utf-8?B?VGYxMDBQd1d5OThoOFE3OWpYM3lVOVhtM1hvQWRCVHg0emVJZC9sRENsTVlJ?= =?utf-8?B?ZmVLRERiR2JBcEFRaEVDNEk3a1QxUTdOcEJuVlY1YWFCZ3FOSXo0VVloTEJz?= =?utf-8?B?ZG9vSFgyOTYvSXcwa2kzdTdSQWF5MlVESEJYR2dZT2pvdUVoVkRhSGNZaE9C?= =?utf-8?B?YzFESEJTZHdjQkEwNWtGdWc5NFVMKzI4MjBUVEtIL2x3VTdXK1FlNUFUNFBw?= =?utf-8?B?SjJqSFI2WGdheXQ2T2FEdlhsREZqbjdlVnRXWkM2OXkzRGtCZ3lnWE9hRzVm?= =?utf-8?B?aDVxb2NlRGpqUzExbm9yL2FKbHlvemlSTjBrZlR1V3JkNGpTNjRYbHpSUWdK?= =?utf-8?B?USt0ZU5UK1Y2NkRXVWRLNXBRbUdQZVNMVXdvN3EwQVBMS1VvL3d4ZjZDYm1K?= =?utf-8?B?YU5iTkprU0VneFBXWkJqYkVhODA1ZFBYNjlpQ2VubVVGQVRFRDhJaFRxUGNy?= =?utf-8?Q?iiBrsB2dSsotAaEGCs?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0c00f19c-8408-42b4-796b-08deee739e37 X-MS-Exchange-CrossTenant-AuthSource: BL1PR12MB5320.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jul 2026 19:49:07.8533 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fLWRWwdIrp7S3GRZK7c2WHO+cpTHzRZrZrXKP7syWL27pQl2C9+bXS4yOs9TCGtL X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB8431 On 7/30/26 14:43, Borislav Petkov wrote: > On Thu, Jul 30, 2026 at 02:39:40PM -0500, Babu Moger wrote: >> Therefore, creating more than 64 monitoring groups in the default >> measurement mode can lead to inaccurate measurement results. > > I have this there now: > > In either case, creating more monitoring groups than available counters can > lead to innacuracies during measurement. > That is correct. Thanks Babu