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Wed, 28 Oct 2026 23:08:30 -0500 Message-ID: <97652b0c-6b51-46d8-9787-4669af3f4eb7@amd.com> Date: Thu, 29 Oct 2026 09:38:29 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf/amd/ibs: add phy_addr_only software filter for ibs_op To: Huang Shijie CC: , , , , , , , , , , , , , , , , , , , , , , , , , <1537577747@qq.com>, Ravi Bangoria References: <20260902085251.4046240-1-huangsj@hygon.cn> Content-Language: en-US From: Ravi Bangoria In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH5PEPF00000031:EE_|PH0PR12MB7981:EE_ X-MS-Office365-Filtering-Correlation-Id: e50dd2cb-1b6a-4c7d-dc34-08df35725158 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|7416014|376014|36860700016|82310400026|11063799006|4143699003|56012099006|261022075727099003|10067099003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 99T54tRs5NfRqm42xwQyiie1y/SvfFDAckhFSZqBrNzcDIBeJsOFd6p4PTjN7a0NqiamUtffLdHJUmGPC3mZW6RPx9ztUEj2LTvazIBuk2EciLU6SArXFC1P/4/SoKYkPbN2e9jp8T3cLPKQslX0G/RYLSgWgIZoJMDCjMBGqXzXz1wM4I9eYYlXGDhqgO49nrqpzjLEtoDLlnVG0vBijrWaC3ytAt3cfGzUZGZu3lO5DqoVowYTztMP6UnZhyAi8shI1vKOmSJp60BKD6eDWSN1A1GepB1pzrw/qpig8aP1UXOe6LTaeVlPyn5IRf9IOzmNEuUO7dB1gWz0EB8EaCWkOZuaaM1pql6hqKPfNEzk00DypQ0RdRoGK3MhnH+2ftDLD3aeTRjdYV0rXbdk3pOBTGlY9nJyQ66Cr2iJ0AD36ukTpAs38ji4Y8E3i89j X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Oct 2026 04:08:41.6470 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e50dd2cb-1b6a-4c7d-dc34-08df35725158 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: PH5PEPF00000031.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7981 Huang, >> Why not simply use the BPF filter? >> $ perf record -e ibs_op// --phys-data --filter 'phys_addr != 0' ... > > I did try the BPF filter. > > Measurements below are system-wide ibs_op sampling for 5s on a > 384-CPU Hygon box under a 400-thread sysbench oltp_read_only load > at three sampling periods: > > -c filter valid samples > ------ ------------ ---------- > 100000 phy_addr_only 19,345,907 > 100000 BPF filter 17,939,819 > > 30000 phy_addr_only 54,670,617 > 30000 BPF filter 47,926,784 > > 10000 phy_addr_only 61,606,488 > 10000 BPF filter 40,826,086 > > > The phy_addr_only produces more *valid* samples than the BPF filter. Can you please confirm if those additional samples are genuinely valid. Thanks, Ravi