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Thu, 17 Nov 2022 01:19:55 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , , , Perry Yuan Subject: [PATCH v2 5/5] Documentation: add amd-pstate kernel command line options Date: Thu, 17 Nov 2022 15:19:10 +0800 Message-ID: <20221117071910.3347052-6-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221117071910.3347052-1-Perry.Yuan@amd.com> References: <20221117071910.3347052-1-Perry.Yuan@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT098:EE_|DM4PR12MB5232:EE_ X-MS-Office365-Filtering-Correlation-Id: 4dd7b304-7656-4a04-1289-08dac86c4658 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(39860400002)(346002)(396003)(136003)(376002)(451199015)(40470700004)(46966006)(36840700001)(186003)(1076003)(16526019)(40460700003)(5660300002)(336012)(7696005)(110136005)(316002)(54906003)(6636002)(41300700001)(2616005)(8936002)(26005)(70586007)(70206006)(36756003)(8676002)(4326008)(82310400005)(36860700001)(81166007)(356005)(82740400003)(2906002)(40480700001)(83380400001)(47076005)(426003)(86362001)(478600001)(6666004)(36900700001)(2101003);DIR:OUT;SFP:1101; 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Also the `disable` parameter can disable the pstate driver loading by adding `amd_pstate=disable` to kernel command line. Reviewed-by: Gautham R. Shenoy Tested-by: Wyes Karny Signed-off-by: Perry Yuan --- Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a465d5242774..42af9ca0127e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6959,3 +6959,14 @@ memory, and other data can't be written using xmon commands. off xmon is disabled. + + amd_pstate= [X86] + disable + Do not enable amd_pstate as the default + scaling driver for the supported processors + passive + Use amd_pstate as a scaling driver, driver requests a + desired performance on this abstract scale and the power + management firmware translates the requests into actual + hardware states (core frequency, data fabric and memory + clocks etc.)