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Shenoy" To: Mario Limonciello , Perry Yuan , Huang Rui , Dhananjay Ugwekar , Swapnil Sapkal , "Rafael J . Wysocki" , Viresh Kumar CC: , , "Gautham R . Shenoy" Subject: [PATCH 2/2] amd-pstate: Switch to amd-pstate by default on some Server platforms Date: Mon, 21 Oct 2024 15:48:36 +0530 Message-ID: <20241021101836.9047-3-gautham.shenoy@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241021101836.9047-1-gautham.shenoy@amd.com> References: <20241021101836.9047-1-gautham.shenoy@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9CE:EE_|DM4PR12MB5913:EE_ X-MS-Office365-Filtering-Correlation-Id: 8301eb42-d83b-454a-d495-08dcf1b9e19e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?dWtavyfg60UE7yKeB/tJdbkHd3Wg0+l17y838x0WNzAtuH9o97/U4jAUyhWC?= =?us-ascii?Q?8Hl7vpGhOxze3xnzZEkOzk7EZ9fjx/5OpbJuscTGFjLIKOk4MmhjH9197EQn?= =?us-ascii?Q?wSz24g9ZrMbNWygdhhHxfDqOyPakfScbXhSKH9f4VHsYzdH98JM6wYLPSJTA?= =?us-ascii?Q?yj3Bx+4+Zc5Qyl6tolOtTntxWsbflJOsu7mKiPcV8OCQ9RNH4LfQttRp1/Bd?= =?us-ascii?Q?z4qvI+CmpL1bq8928bG5IuSB0S0EZo5NSD2Dph5XmyVkPKQau4kkJhm7J7ra?= =?us-ascii?Q?UEOiIB4V1mhENgqzT2CD5LKx4DXDsdW2bGgmCkVeUtlilWRIjKWr1vVpx/A5?= =?us-ascii?Q?Mcngllft5tilX9+lWPIrg8pwZy6PZGKYo3XbP+6BRE7VBNhD1PEl1yWM2gMb?= =?us-ascii?Q?ySAYGTRlMg9Mjd2Z+b6QKYLwvjNcxkiLwepHpGfKG+BMxIjqrFrR7ocowMkc?= =?us-ascii?Q?8+lF7pdHTZkka5WOMLy5ufhGscVO0VxdcoC6CEOizOSqK7LbptWUlOXRHdyO?= =?us-ascii?Q?sHYy1vdmoPP52k7CmamaVmNtFHE2vKdYr+6h0jMzCG9jSnkXBvaaDZXXUDK0?= =?us-ascii?Q?wIje1gC65Cbv/Xf0eA86ns8+lkezfswWdaIm/3Yle0uhdIma5wVSbqGzBF3W?= =?us-ascii?Q?y1KHtrLZb50iJ8iXZLe8h9iOxbf5/c2RPP7jXKZeMtBR7OQ3D+0oepA4KVkK?= =?us-ascii?Q?h2bw2wtVTvdGVetw8/HrV/gLWg4N31S1Y2b73Nt9D5lLtWR3KpOha0AtSNdb?= =?us-ascii?Q?Yw1GWD4b1zjM3oItmZLscBdTX3XaSs7DAMp72b7iS8M5dfLRrPYWDegAk2hQ?= =?us-ascii?Q?/guEmJHxFQhEs1kERrUE76WZwRU4vucYPSqcs5wRuSbP/SZxuXkJyMMw0Rt0?= =?us-ascii?Q?yxl4Fx1uPvDdyak888t+2by2zRWqSYVTj9DsY/JjgWCmoigka+j4A98X6V+W?= =?us-ascii?Q?745tSPPGcEDBoMDRDThmTrX1yQ6usfz4dXyi02/XClEjyt+50nx00toDo+Bz?= =?us-ascii?Q?nyDoXNdLCdyVNBAqLx2ngmD+kq9ZtZw8LPBXDn89HKBr/FUDc+rIoKduiI3W?= =?us-ascii?Q?tLZnSW5MWUywnoIyX+7L0NdXca4uJ7HsQgNXLoVAop2UU7WNkK2ZS2g4WAZe?= =?us-ascii?Q?+ZtbgHnMOapJ7Vib7lzknEYcVYu/lo09ffC03E6PjXm+Nf/p5d86c1XUI56u?= =?us-ascii?Q?/MEk65N4T0HQCKXxbqSFLOCnuVK2W2/4zYyNO9ZEWT3FgpO3vAUrHSiyM+7z?= =?us-ascii?Q?jtQA5ZFzEX1EnxQrkZlonpZkALgKh4QhjjQhDsfW5YfMcNPtwddCu9ig74NK?= =?us-ascii?Q?cqg7xg6MKzcmEoaC1GPlrNNNp+I6GcdBTAvj2x2NSDaMl3CmFMNOA2iRSJxx?= =?us-ascii?Q?EKSMEa1klsfQKiQ+SIJ5WWTPGaHBslAAY5d2XvlBZyLjVsuisQ=3D=3D?= 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:(13230040)(82310400026)(376014)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Oct 2024 10:19:43.4731 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8301eb42-d83b-454a-d495-08dcf1b9e19e 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9CE.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5913 Content-Type: text/plain; charset="utf-8" From: Swapnil Sapkal Currently the default cpufreq driver for all the AMD EPYC servers is acpi-cpufreq. Going forward, switch to amd-pstate as the default driver on the AMD EPYC server platforms with CPU family 0x1A or higher. The default mode will be active mode. Testing shows that amd-pstate with active mode and performance governor provides comparable or better performance per-watt against acpi-cpufreq + performance governor. Likewise, amd-pstate with active mode and powersave governor with the energy_performance_preference=3Dpower (EPP=3D255) provides comparable or better performance per-watt against acpi-cpufreq + schedutil governor for a wide range of workloads. Users can still revert to using acpi-cpufreq driver on these platforms with the "amd_pstate=3Ddisable" kernel commandline parameter. Signed-off-by: Swapnil Sapkal Signed-off-by: Gautham R. Shenoy --- drivers/cpufreq/amd-pstate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 23349f50c83e..3c14962adeb2 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1832,10 +1832,10 @@ static int __init amd_pstate_init(void) if (cppc_state =3D=3D AMD_PSTATE_UNDEFINED) { /* Disable on the following configs by default: * 1. Undefined platforms - * 2. Server platforms + * 2. Server platforms with CPUs older than Family 0x1A. */ if (amd_pstate_acpi_pm_profile_undefined() || - amd_pstate_acpi_pm_profile_server()) { + (amd_pstate_acpi_pm_profile_server() && boot_cpu_data.x86 < 0x1A)) { pr_info("driver load is disabled, boot with specific mode to enable thi= s\n"); return -ENODEV; } --=20 2.34.1