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Wed, 7 Oct 2026 22:21:54 +0000 Message-ID: Date: Wed, 7 Oct 2026 15:21:51 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/3] x86,fs/resctrl: Keep mbm_assign_mode in default mode at boot To: Babu Moger , , CC: , , , , , , , , , , , , , , , References: <200d21ee-3041-40f2-9032-18e8544a7030@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4P223CA0030.NAMP223.PROD.OUTLOOK.COM (2603:10b6:303:80::35) To CH3PR11MB8384.namprd11.prod.outlook.com (2603:10b6:610:176::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR11MB8384:EE_|DM3PPFCBDC4B878:EE_ X-MS-Office365-Filtering-Correlation-Id: 454727fd-f24b-4b83-4839-08df24c16490 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|23010399003|1800799024|10067099003|11063799006|56012099006|4143699003|18002099003|22082099003|6133799003; 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That breaks the pqos tool [1], which assumes the historical >>> default mode. pqos treats a non-numeric event read as zero bandwidth. It >>> creates 16 or more monitoring groups and uses two counters per group. >>> On a platform with 32 counters per domain, that consumes the pool, so >>> further groups read "Unassigned" and pqos reports 0 MB/s for them: >>> >>>    $sudo pqos -m all:0-4 >>>    CORE         IPC      MISSES     LLC[KB]   MBL[MB/s]   MBR[MB/s] >>>       0        0.69         16k       192.0         0.0         0.0 >>>       1        0.40          3k         0.0         0.0         0.0 >>>       2        0.44          1k        64.0         0.0         0.0 >>>       3        0.39          1k        64.0         0.0         0.0 >>>       4        0.43          1k         0.0         0.0         0.0 >>> >>> Leave mbm_assign_mode in "default" mode during initialization. Default >>> mode uses one counter per monitoring group. On existing AMD platforms >>> that pool is 64 counters and may be larger on newer hardware. The >>> "mbm_event" mode uses two counters per group, so 32 counters cover only >>> 16 groups. >>> >>> Deployments within that pool receive accurate bandwidth measurements >>> with default mode. The hardware supports 4096 monitoring groups. Beyond >>> that pool, readings may be misleading or "Unavailable", with no >> >> At this point I am lost because the word "pool" is used to mean three >> different things. It is used for the number of "ABMC counters" as well >> as the number of "non-ABMC counters" that exist on the same platform, >> above it seems to be used for number of RMIDs (number of monitoring >> groups) also. Could you please add some context at beginning of >> changelog to introduce the various counts applicable to the description, >> associate unique terms to these counts at that time, and then use >> those unique terms in the rest of the changelog? > > Sure. > I can name as "ABMC counters pool" and "default active counters pool" hmmm ... "active counter" is new term that, when grepping this series, fs/resctrl/*, and arch/x86/kernel/cpu/resctrl/*, does not appear a single time. If this new term is needed then please include a definition as part of the changelog context that makes it obvious what it refers to. Reinette