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bh=Flu2rjnjiuC2pk8QFQEJfl+FcsBzpdwIhBt4jxSk7qw=; b=WjDQzy/XkXwcJJomDS+sQSaVRluNYH6Vcl//2m/SSqcW/+h+i7XyBvdN4SfoccCV0xzyLrlCLMjWUIjeV35lnKSmGPgOUAeC5UNNTg14SfRy8W4FYf0LYkGa2Ap3wIwKE82PeDMVCwSpDOiAH7yTCHxXQbDkIoYOtpGmFtGnry8= Received: from DM8PR10MB5416.namprd10.prod.outlook.com (2603:10b6:8:3f::19) by DS7PR10MB4831.namprd10.prod.outlook.com (2603:10b6:5:3ab::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7875.15; Mon, 12 Aug 2024 22:43:38 +0000 Received: from DM8PR10MB5416.namprd10.prod.outlook.com ([fe80::e085:31f:84d1:e51a]) by DM8PR10MB5416.namprd10.prod.outlook.com ([fe80::e085:31f:84d1:e51a%4]) with mapi id 15.20.7875.012; Mon, 12 Aug 2024 22:43:38 +0000 References: <20240726201332.626395-1-ankur.a.arora@oracle.com> User-agent: mu4e 1.4.10; emacs 27.2 From: Ankur Arora To: "Tomohiro Misono (Fujitsu)" Cc: 'Ankur Arora' , "linux-pm@vger.kernel.org" , "kvm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "catalin.marinas@arm.com" , "will@kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "pbonzini@redhat.com" , "wanpengli@tencent.com" , "vkuznets@redhat.com" , "rafael@kernel.org" , "daniel.lezcano@linaro.org" , "peterz@infradead.org" , "arnd@arndb.de" , "lenb@kernel.org" , "mark.rutland@arm.com" , "harisokn@amazon.com" , "mtosatti@redhat.com" , "sudeep.holla@arm.com" , "cl@gentwo.org" , "joao.m.martins@oracle.com" , "boris.ostrovsky@oracle.com" , "konrad.wilk@oracle.com" Subject: Re: [PATCH v6 00/10] Enable haltpoll on arm64 In-reply-to: Date: Mon, 12 Aug 2024 15:43:27 -0700 Message-ID: <87v805qs4w.fsf@oracle.com> Content-Type: text/plain X-ClientProxiedBy: BN0PR07CA0005.namprd07.prod.outlook.com (2603:10b6:408:141::20) To DM8PR10MB5416.namprd10.prod.outlook.com (2603:10b6:8:3f::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM8PR10MB5416:EE_|DS7PR10MB4831:EE_ X-MS-Office365-Filtering-Correlation-Id: 025e352b-bb55-423c-0266-08dcbb20346e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|366016|1800799024|376014; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Tomohiro Misono (Fujitsu) writes: >> Subject: [PATCH v6 00/10] Enable haltpoll on arm64 >> >> This patchset enables the cpuidle-haltpoll driver and its namesake >> governor on arm64. This is specifically interesting for KVM guests by >> reducing IPC latencies. >> >> Comparing idle switching latencies on an arm64 KVM guest with >> perf bench sched pipe: >> >> usecs/op %stdev >> >> no haltpoll (baseline) 13.48 +- 5.19% >> with haltpoll 6.84 +- 22.07% > > I got similar results with VM on Grace machine (applied to 6.10). Great. Thanks for testing. > [default] > # cat /sys/devices/system/cpu/cpuidle/current_driver > none > # perf bench sched pipe > # Running 'sched/pipe' benchmark: > # Executed 1000000 pipe operations between two processes > > Total time: 23.832 [sec] > > 23.832644 usecs/op > 41959 ops/sec > > [With "cpuidle-haltpoll.force=1" commandline] > # cat /sys/devices/system/cpu/cpuidle/current_driver > haltpoll > # perf bench sched pipe > # Running 'sched/pipe' benchmark: > # Executed 1000000 pipe operations between two processes > > Total time: 6.340 [sec] > > 6.340116 usecs/op > 157725 ops/sec > > Tested-by: Misono Tomohiro Thanks! -- ankur