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Wed, 21 Jan 2026 16:11:47 +0000 Date: Wed, 21 Jan 2026 16:11:42 +0000 From: Bruce Richardson To: Stephen Hemminger CC: , Subject: Re: [PATCH v2 2/6] test: fix timeout for atomic test on high core count systems Message-ID: References: <0260118201223.323024-1-stephen@networkplumber.org> <20260120015759.301155-1-stephen@networkplumber.org> <20260120015759.301155-3-stephen@networkplumber.org> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260120015759.301155-3-stephen@networkplumber.org> X-ClientProxiedBy: DU6P191CA0047.EURP191.PROD.OUTLOOK.COM (2603:10a6:10:53f::12) To DS0PR11MB7309.namprd11.prod.outlook.com (2603:10b6:8:13e::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7309:EE_|CY8PR11MB7876:EE_ X-MS-Office365-Filtering-Correlation-Id: 40e9a957-f22e-40b9-c0c4-08de5907c6df X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016|7053199007; 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This causes > two problems on high core count systems: > > With many cores (e.g., 32), the massive contention on shared > atomic variables causes the test to exceed the 10 second timeout. > > Scale iterations inversely with core count to maintain roughly > constant test duration regardless of system size > > With 32 cores, iterations drop from 1,000,000 to 31,250 per worker, > which keeps the test well within the timeout while still providing > meaningful coverage. > > Bugzilla ID: 952 > Fixes: af75078fece3 ("first public release") > Cc: stable@dpdk.org > > Signed-off-by: Stephen Hemminger > --- > app/test/test_atomic.c | 52 ++++++++++++++++++++++++++---------------- > 1 file changed, 32 insertions(+), 20 deletions(-) > Tested-by: Bruce Richardson Acked-by: Bruce Richardson Tested this on a system with 96 cores and test no longer times out or fails for me.