Received-SPF: pass (google.com: domain of linux-kernel+bounces-75511-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1;
References: <20240213055554.1802415-1-ankur.a.arora@oracle.com>
 <15fcf98c-58c5-fa08-2e21-f3b0baf058e6@amd.com> <87zfvtg2mh.ffs@tglx>
 <f1a5fe09-f4bc-0dc5-edda-6b3e690bc0e3@amd.com>
User-agent: mu4e 1.4.10; emacs 27.2
From: Ankur Arora <ankur.a.arora@oracle.com>
To: Raghavendra K T <raghavendra.kt@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        Ankur Arora
 <ankur.a.arora@oracle.com>, linux-kernel@vger.kernel.org,
        peterz@infradead.org, torvalds@linux-foundation.org,
        paulmck@kernel.org, akpm@linux-foundation.org, luto@kernel.org,
        bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com,
        mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org,
        willy@infradead.org, mgorman@suse.de, jpoimboe@kernel.org,
        mark.rutland@arm.com, jgross@suse.com, andrew.cooper3@citrix.com,
        bristot@kernel.org, mathieu.desnoyers@efficios.com,
        geert@linux-m68k.org, glaubitz@physik.fu-berlin.de,
        anton.ivanov@cambridgegreys.com, mattst88@gmail.com,
        krypton@ulrich-teichert.org, rostedt@goodmis.org,
        David.Laight@ACULAB.COM, richard@nod.at, mjguzik@gmail.com,
        jon.grimm@amd.com, bharata@amd.com, boris.ostrovsky@oracle.com,
        konrad.wilk@oracle.com
Subject: Re: [PATCH 00/30] PREEMPT_AUTO: support lazy rescheduling
In-reply-to: <f1a5fe09-f4bc-0dc5-edda-6b3e690bc0e3@amd.com>
Message-ID: <87ttm1frgf.fsf@oracle.com>
Date: Wed, 21 Feb 2024 13:16:49 -0800
Content-Type: text/plain
Precedence: bulk
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: 
	=?us-ascii?Q?QFhyxCCNPPYDvvhOjv7xyjx3qyWaa/X52WehMarfoX5AJDEgbfr1r/wO3r8a?=
 =?us-ascii?Q?fHgkAnQGPMhw70wMNXFQHctMQzgUt3liFsU+dVP3c6msMXDqJGzKznOliCE7?=
 =?us-ascii?Q?4epx7oMa1aQ4y/hi/2pGl7clmQeS5ia7m4XHm4s1f6XUmTASXo56Walcq+zW?=
 =?us-ascii?Q?0nRM0ofPPug/oHF47Gg0Gj5w9V8pobLlomE/IQ0HwyxP5viDaSd0YSGkfyvh?=
 =?us-ascii?Q?iCGtrAQwxZrSCzW6yDTNKiVc8Q2OnMm5iMiJrQFtW0IeEEpu2q87+2Dj2QP+?=
 =?us-ascii?Q?abq0ri3YW3ffH+h0u3Zhbaup9WzakJ0KLtSNRzhMFiMo7R51l9q1L0QL9ASX?=
 =?us-ascii?Q?IEII1GmQa/HRPJptSLhzE2+q+ITmMTanXkrNSRaHpSIZxKrPrehe4BM8SBSq?=
 =?us-ascii?Q?VVNNC8zxn90cc2gZtaLvRKd2DVdIaBHMH3MlipTJA9ZoP5dF6RSjwEKUsXbx?=
 =?us-ascii?Q?Dhxh7NI3AdMC4qD4YgXnTSYcwTKVnEBZwl5aKyzUGv3FhnoK9UiZQAz53Z6D?=
 =?us-ascii?Q?m+ejEka/ZKbK/GDUcinoEUX8B898n4iqr+eqXss+RZhw4mbgyenqCl/YSAcZ?=
 =?us-ascii?Q?yfxsLzDMIMQXy0o2LxE27SfdOqG/i2HpzfrtudY6haMlXZzsdEkGsL46rFbs?=
 =?us-ascii?Q?CMSjNM3YvWZzGwtvp9NaTPkh2g92oO7Eb/2PPrLAv6z+mBncAUeSxhsShAgg?=
 =?us-ascii?Q?u/EhJq7HlevTqKosmEKpYowIJq/hMNDjbVIXJfb5xBFBnZhIhxkYSqRYVDpb?=
 =?us-ascii?Q?PDdjxo4/vEY/e0AWseXQH98GaVYVvA6Whud1/vX1BUuz9LkC0PsP6xPQGo5o?=
 =?us-ascii?Q?SARBq/MQwR/qjkfBLNSrL8NO8Zmrm4t7Wdpl2ZmgiXxKhbtDNSg7g7CgjUtq?=
 =?us-ascii?Q?TJ/bOGdyrHFx7vp9+Hc20uzBVzgWWUgcXFL4ZCE+ucGjq8zJdapU0wdXBHKm?=
 =?us-ascii?Q?jfOzz4pbNDdeQSq0wh3HKcgQ1UGByKPZk7UJY5jZoCZ+F5E58qs1DBlVMjS/?=
 =?us-ascii?Q?Eo8keqyVvZQrD51yigPNxq+/MlwTS/oGpww3RfcmESvqk51UI+I4LJ999uqG?=
 =?us-ascii?Q?e2v/wASkYMbxxpGnUVk+rwiGjpW6bNLnzcJSITIfWX7IHNX16QFcLHjPJHs0?=
 =?us-ascii?Q?704W8tllilhuv1eOpa0J6YMkEsRgGhy7he+iGOk2qJjXiZRZNyoTUB/571VR?=
 =?us-ascii?Q?ubGWk6vl6Ra+7jezPzz0m8LEm1UWbQELddjQeAsSQt4uMjSdwfyMK0GTrKjE?=
 =?us-ascii?Q?csjQgjqJmmlDfS3vMdGeBMcR3mSvuYgDewBB8mBFgsaphZjs418sSltJoIDN?=
 =?us-ascii?Q?gxQUEwkHvQD16TiddYbJsMg5J4aYxtjpdiDS1d3NPWQSNZzhsULGrsdLVF2O?=
 =?us-ascii?Q?xUfWmrVg7fMduqTB6TusxYvQWxRg5KlzhU9zlRenJGzwVMeGoHKQq8gwSPeG?=
 =?us-ascii?Q?eaI1D9I1axkD4F1KPca2KbbauV74IMswfV2iMxbH1Rxqb3Y37t6LApX4Jctc?=
 =?us-ascii?Q?FIzcsL6zQtnEB7PQ6CEQf4WlDMAoBXMIs5+8KP4VwMdIO/NMqHyALQUb3TnL?=
 =?us-ascii?Q?QilmYzEcGA0fGLfDZboMHbUPO5lUAr1XmH7yScoYHZbVP6+GmgwB1We6kdTM?=
 =?us-ascii?Q?yQ=3D=3D?=
X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 
	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
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-Network-Message-Id: ee0889d5-32db-4d88-6ecf-08dc33225c9e
X-MS-Exchange-CrossTenant-AuthSource: CO6PR10MB5409.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Feb 2024 21:16:25.7340
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: kLa/Og/UW7Gm9Z8s/icn/2pr034PXVAPz6mxxJTG4JklvNj496HHwPcEp3DJ/wyeXY7BCF2+eTcqC/vId0QyNHdjtSRC9maSAVBbCPrNWKA=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR10MB7712
X-Proofpoint-Virus-Version: vendor=baseguard
 engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26
 definitions=2024-02-21_09,2024-02-21_02,2023-05-22_02
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 phishscore=0 malwarescore=0
 bulkscore=0 adultscore=0 suspectscore=0 spamscore=0 mlxlogscore=905
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000
 definitions=main-2402210166
X-Proofpoint-GUID: CiayByfjVbTol-c2SwWK8UnliygWVegb
X-Proofpoint-ORIG-GUID: CiayByfjVbTol-c2SwWK8UnliygWVegb


Raghavendra K T <raghavendra.kt@amd.com> writes:

> On 2/21/2024 10:45 PM, Thomas Gleixner wrote:
>> On Wed, Feb 21 2024 at 17:53, Raghavendra K T wrote:
>>> Configuration tested.
>>> a) Base kernel (6.7),
>> Which scheduling model is the baseline using?
>>
>
> baseline is also PREEMPT_DYNAMIC with voluntary preemption
>
>>> b) patched with PREEMPT_AUTO voluntary preemption.
>>> c) patched with PREEMPT_DYNAMIC voluntary preemption.
>>>
>>> Workloads I tested and their %gain,
>>>                      case b                   case c
>>> NAS                +2.7                    +1.9
>>> Hashjoin,          +0			     +0
>>> XSBench	     +1.7		     +0
>>> Graph500,  	     -6 		     +0
>> The Graph500 stands out. Needs some analysis.
>>
>
> Sure. Will do more detailed analysis and comeback on this.

Thanks Raghu. Please keep me posted.

Also, let me try to reproduce this locally. Could you post the
parameters that you used for the Graph500 run?

Thanks

--
ankur