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client-ip=165.204.84.17; helo=satlexmb08.amd.com; pr=C Received: from satlexmb08.amd.com (165.204.84.17) by CY4PEPF0000EE3F.mail.protection.outlook.com (10.167.242.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9632.12 via Frontend Transport; Tue, 24 Feb 2026 08:12:04 +0000 Received: from Satlexmb09.amd.com (10.181.42.218) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Tue, 24 Feb 2026 02:12:04 -0600 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb09.amd.com (10.181.42.218) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Tue, 24 Feb 2026 00:12:04 -0800 Received: from [10.136.44.195] (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.17 via Frontend Transport; Tue, 24 Feb 2026 02:12:00 -0600 Message-ID: Date: Tue, 24 Feb 2026 13:41:54 +0530 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/5] perf/amd/ibs: Account interrupt for discarded samples To: Michael Petlan , Peter Zijlstra , Ingo Molnar CC: Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Dapeng Mi , James Clark , Sadasivan Shaiju , , , , "Manali Shukla" , Santosh Shukla , Ananth Narayan , Sandipan Das , Ravi Bangoria References: <20260216042216.1440-1-ravi.bangoria@amd.com> <20260216042216.1440-2-ravi.bangoria@amd.com> <79e0c820-e934-47a1-abd-3612e82b310@redhat.com> Content-Language: en-US From: Ravi Bangoria In-Reply-To: <79e0c820-e934-47a1-abd-3612e82b310@redhat.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 5gQxRB7I2bNzfYsKJpfGUtV3OR+KU0r8MnyHolNYYEsN3DK+p8KFhz8OFkk732AJ64aVYDVJpBBASd3oOXShQ6Hd0V3/6+eqRnG6uWrv9D6ZOf1y7FPrFUi4XGy7MGWo04suka9x3a4MYdkxFLnk3UUSQksP4CmIX3cQ4tMlrxDTjvuCTsFJQWQTGBFXi26qpsmbtHk0yBQu/W2Lbui8kepBuADeOYrxnGSBy6zwinNAm8abkWnNlyxndk4L7ty3oJAzjSTSFjCfWN3CCB8wEE3asw3+u8s/6v0ksWhGfYX4CqSo1IvZVZHFrD8kCk8gzEDHMoUDktLb9XKYXgRuDjDsstCIw6UZDrfghlTYl33jL4PRcnXfvt/dv3pCRKKSBgdu0tZIR4U/PTyWAsR1s981B64xEqE9yBrUQdgV75LKItuLMAoCxbT4tz29sjzE X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2026 08:12:04.9131 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 243ee1c0-b242-4c60-480b-08de737c658c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE3F.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN5PR12MB9509 Hi Michael, >> Add interrupt throttling accounting for below cases: >> >> o IBS Op PMU: A software filter (in addition to the hardware filter) >> drops samples whose load latency is below the user-specified >> threshold. >> >> o IBS Fetch PMU: Samples discarded due to the zero-RIP erratum (#1197). >> >> Although these samples are discarded, the NMI cost is still incurred, so >> they should be counted for interrupt throttling. >> > > Maybe worth tagging > > Fixes: 26db2e0c51fe83e1dd852c1321407835b481806e ("perf/x86/amd/ibs: Work around erratum #1197") > Fixes: d20610c19b4a22bc69085b7eb7a02741d51de30e ("perf/amd/ibs: Add support for OP Load Latency Filtering") Yes, makes sense. Ingo / Peter, Please let me know if you want me to respin. Thanks, Ravi