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Wed, 31 Jul 2024 12:59:55 +0000 Message-ID: <79151d6b-1f42-4140-847a-5247c86eddcc@intel.com> Date: Wed, 31 Jul 2024 14:59:46 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next V3 3/3] net/mlx5: Implement PTM cross timestamping support To: Tariq Toukan , "David S. Miller" , Jakub Kicinski , Paolo Abeni , "Eric Dumazet" CC: , Saeed Mahameed , Gal Pressman , Leon Romanovsky , John Stultz , Thomas Gleixner , "Anna-Maria Behnsen" , Frederic Weisbecker , , Bjorn Helgaas , , Ingo Molnar , Borislav Petkov , Dave Hansen , , Carolina Jubran , Bar Shapira , Rahul Rameshbabu References: <20240730134055.1835261-1-tariqt@nvidia.com> <20240730134055.1835261-4-tariqt@nvidia.com> Content-Language: en-US From: Wojciech Drewek In-Reply-To: <20240730134055.1835261-4-tariqt@nvidia.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: ZR2P278CA0073.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:52::16) To MW4PR11MB5776.namprd11.prod.outlook.com (2603:10b6:303:183::9) Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW4PR11MB5776:EE_|DM4PR11MB6479:EE_ X-MS-Office365-Filtering-Correlation-Id: cb11514c-2aff-4e02-41cf-08dcb160acdd X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014; 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Tests with phc2sys measured the maximum offset values at a 50Hz > rate, with and without PTM. > > Results: > > 1. No traffic > +-----+--------+--------+ > | | No-PTM | PTM | > +-----+--------+--------+ > | FRC | 125 ns | <29 ns | > +-----+--------+--------+ > | RTC | 248 ns | <34 ns | > +-----+--------+--------+ > > 2. With traffic > +-----+--------+--------+ > | | No-PTM | PTM | > +-----+--------+--------+ > | FRC | 254 ns | <40 ns | > +-----+--------+--------+ > | RTC | 255 ns | <45 ns | > +-----+--------+--------+ > > Signed-off-by: Rahul Rameshbabu > Co-developed-by: Carolina Jubran > Signed-off-by: Carolina Jubran > Signed-off-by: Tariq Toukan > --- Reviewed-by: Wojciech Drewek <...>