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Thu, 27 Mar 2025 11:14:17 +0000 Message-ID: <457a6070-b34e-4467-8251-f69c4015fccb@intel.com> Date: Thu, 27 Mar 2025 19:14:02 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH] sched: Cache aware load-balancing To: CC: , , , , , , , , , , , , , Madadi Vineeth Reddy , Peter Zijlstra References: <20250325120952.GJ36322@noisy.programming.kicks-ass.net> <8f5f01cc-c88d-40e6-bc64-74d0e2093bf3@linux.ibm.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <8f5f01cc-c88d-40e6-bc64-74d0e2093bf3@linux.ibm.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KU1PR03CA0027.apcprd03.prod.outlook.com (2603:1096:802:19::15) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB6020:EE_|IA1PR11MB6098:EE_ X-MS-Office365-Filtering-Correlation-Id: aaa603a9-8296-46f5-8f31-08dd6d208377 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|7416014|1800799024; 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Specifically any case of multiple cache domains inside a >> node. >> >> Anyway, I wrote this about a year ago, and I mentioned this at the >> recent OSPM conf where Gautham and Prateek expressed interest in playing >> with this code. >> >> So here goes, very rough and largely unproven code ahead :-) >> >> It applies to current tip/master, but I know it will fail the __percpu >> validation that sits in -next, although that shouldn't be terribly hard >> to fix up. >> >> As is, it only computes a CPU inside the LLC that has the highest recent >> runtime, this CPU is then used in the wake-up path to steer towards this >> LLC and in task_hot() to limit migrations away from it. >> >> More elaborate things could be done, notably there is an XXX in there >> somewhere about finding the best LLC inside a NODE (interaction with >> NUMA_BALANCING). > > Tested the patch on a 12-core, 96-thread Power10 system using a real-life > workload, DayTrader. Do all the Cores share the same LLC within 1 node? If this is the case, the regression might be due to over-migration/task stacking within 1 LLC/node. This patch should be modified that cache aware load balancing/wakeup will not be triggered if there is only 1 LLC within the node IMO. thanks, Chenyu > > Here is a summary of the runs: > > Users | Instances | Throughput vs Base | Avg Resp. Time vs Base > -------------------------------------------------------------- > 30 | 1 | -25.3% | +50% > 60 | 1 | -25.1% | +50% > 30 | 3 | -22.8% | +33% > > As of now, the patch negatively impacts performance both in terms of > throughput and latency. > > I will conduct more extensive testing with both microbenchmarks and > real-life workloads. > > Thanks, > Madadi Vineeth Reddy >