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Thu, 16 Oct 2025 04:57:17 +0000 Message-ID: <7cacde40-153b-4814-8460-0805f1eb7bdb@intel.com> Date: Thu, 16 Oct 2025 12:57:04 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/19] Cache Aware Scheduling To: Madadi Vineeth Reddy CC: Tim Chen , Peter Zijlstra , Ingo Molnar , K Prateek Nayak , "Gautham R . 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?ZXRKV0NOb29GZDVvQUxHSFRiMlNGcGxiYkZMY0ltVWFydisxTkZRNlpINEpP?= =?utf-8?B?dWhCQU00SUhRYVJ4UWhiU29DYUVqNU1GbXBsUGg0VVVxTjZRaXFWaG96M3hJ?= =?utf-8?B?OHJEMnlKSGZNWkZYREFoamRnVE40amtEZzBaMTV1VFJYRFdLRUVVY1pVSTg4?= =?utf-8?B?K042QU5PVUJPTGVONmVxNXNXM1BzdmptVUVTK0NjMFlPUDhhTGtGSkxMVmt5?= =?utf-8?B?NU9IOFZFVEZEeVhGUm5EZkRzdGFCZ0ZtVVp1elJHdkFaNytRK2ZGUVRtWG0v?= =?utf-8?B?QXovVEtuMFVvVHMzOUp0Z3RocXQ0Z3lUMWlsaHlrZVgzKzJtR0pIL1dlNXRD?= =?utf-8?B?R3dISUc3RFNLbjYveXUyUlRkM0xOczljVDdDWHNXKzBlVVA4RUpCRVhKemJl?= =?utf-8?B?M1BPR0ZKSFhpMFF1VDE0VzZCMTd4S2UzdVdGdnpqa2hiZGl0K215NVU4dVVR?= =?utf-8?B?ZjdxY2dKUDBXSTFCSThKSVprQkZkSkVCT2Q1bHdHSzE2d0tLTHpITTQ1cmdI?= =?utf-8?B?RU53alN1L3AyaTdrUUJUZy91ZWg2NWFncXMreTNvYmcvUVF6QUFHRXNpUHZ2?= =?utf-8?B?U3Y5cUpCOHNzRTFYMjZEczdKK1NVR1A2b0t3M2dmT2hxOG9SR29sOXZQRVc2?= =?utf-8?B?K2U3TXQxMVNCV3pTaEJVRmN6VVo2cXFSeUZ6OEt0RWlybHluUmFDSXd0SHU5?= =?utf-8?B?eGV4cmp3V0pUWGxDY0JEVmdtUG94enNDY1lhbytIZTFUUENIVzd6WlV5RVE5?= =?utf-8?B?TG01WmNPa3Fwb3ZGY3BGZ2Z1TFZuYkFBNGdaNkg5elYrMTFRbEk5bU9makdo?= =?utf-8?B?ajEyL21NWWZTTjluLzQ5M1dlRkVzUlJzNXlBV1BPcktFZmh4bWsvZTZNbFVR?= =?utf-8?B?R0EzanpMN3NMbXBSbDlOKzVsYzJLN2hpSDI3TTBiTDg3VFk2ODJ1R1U2ME1l?= =?utf-8?B?L0hya1FIVjJWMkpjQUVpYmRQV1IrNmJ2S1dKcXM2RWdwLytzUGhtRWpIWXBO?= =?utf-8?B?K0xEQ3gySUJkS1dkKzBrVHlZeEhUdVlzVExrREVWaGFWYlhuQUQ4NGtTWXlY?= =?utf-8?B?eE4wTnJkMC9mUEZXdjc4Ny9tbUNvSXFNL2pTSG4rejRqbXZPYklWb2czWG5J?= =?utf-8?B?TmttTDBDdmU3cEJHTjFqMHJlb2FXakM2SXJSWGIwS2htS0dEcURKdGxGV0tw?= =?utf-8?B?MFNRRGpEQXk5eEVUcnpjeW15WGF6a0U0dUdMSUptSzM4TjFTSzdtWEhpVXl5?= =?utf-8?B?Zlg5eFdMb1BTRHpMTGJyaVZDaXN2cC9ZS1paZFhkbzFaRFZ5dFE4VDViTXdv?= =?utf-8?B?bHdITGlvME1wRXB0cmhOcklWdW9kdTNhcTNXN0pDbjdwYS9IOTNIbnlydy90?= =?utf-8?B?Q3U4ZWZKUGpaSWpBODlEblVURHhMejZTWVpYd1RnQzBsWWRMZGg5eXdzM2d2?= =?utf-8?B?aFFibGxiUnNwb242ZFBjSGJxeGZwaGo5NE9lV2I3dGU1ZnlOTlc0U21UU2Ez?= =?utf-8?B?Tm1penQ3RWZHV2liTVFZV1NoeW9hZ2x6RzJrZFc3QmNiRHpuZEU4Z1B4OXJ2?= =?utf-8?B?NWRUc1VBbStybjVJaUczMEVqWFRTTHFqdUxpQUVHNXhIb0k4N3E5alJreFVW?= =?utf-8?B?YkZ4S0JIekt1RkUxZE1RelRhVlFaL1V6VDFCelZiV0dtc3RFbUs5SHVUUWly?= =?utf-8?B?QUdQWUNDdXY2dnRzWGlpRUZNZmVpazBjQ2VQalF2OUFVLzl2UUpTS3BDaTA4?= =?utf-8?B?cG9rN3R2bkVaUEYwck83blFtc0tERTUwWTI1TFFEdHhaQ0tKUXkvTVkzOFlX?= =?utf-8?B?UG9heGlLWktHOEh5WHJocWNwRUkyWisyMUNlTTRUTkErSHVDWHAvTm05QnFO?= =?utf-8?B?RkJWamhtWjh5NGhTcnB3dUpyYkpvNUZwTUIvR3lKWkswT0s3TWRQZzlvQ0pD?= =?utf-8?B?YnJsclB2MU0yd2RoaDVYclVKRm9qSzN6S1BTZHNpVVhtdE9uMVJ3V09jdWph?= =?utf-8?B?dTdnQUYxZWdKSU1EdnV4RFNSSEZMZWM1ZDVRYmNqUWxsMzNhYnVPbWtQMGlJ?= =?utf-8?B?K1V3M0lnNzdnOVNnYmtRZUp1bzh3NkJOQmFiNi9qWlMrWFM5Ui9HenIxaDlQ?= =?utf-8?Q?0jibISlxLEbvLzRyMLjDFgHmm?= X-MS-Exchange-CrossTenant-Network-Message-Id: 39a9e82b-4b45-4fbc-244c-08de0c707b07 X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6020.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2025 04:57:17.4666 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: TnaRd7BsvvGBqvI6CvjKcl4EPjmpuXozCLaN4Dj1bN2Tk3pLDq7hzIJWrzAHDpcij7woe85iluPgpxOMa0CKdg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR11MB7264 X-OriginatorOrg: intel.com On 10/16/2025 2:26 AM, Madadi Vineeth Reddy wrote: > On 15/10/25 11:08, Chen, Yu C wrote: >> On 10/15/2025 5:48 AM, Tim Chen wrote: >>> On Tue, 2025-10-14 at 17:43 +0530, Madadi Vineeth Reddy wrote: >>>> Hi Tim, >>>> Thanks for the patch. >>>> >>>> On 11/10/25 23:54, Tim Chen wrote: [snip] >>>> ChaCha20-xiangshan improvement in Genoa when llc_aggr_tolerance is set to 100 seems >>>> due to having relatively lesser thread count. Please provide the numbers >>>> with default values too. Would like to know numbers on varying loads. >>> >>> I'll ask Chen Yu who did the Xiangshan experiments if he has those numbers. >>> >> >> Madadi, do you mean the performance score number or active thread number >>  when llc_aggr_tolerance is set to 1(default)? >> The score is around with sched_cache and llc_aggr_tolerance set to 1. >> The active number is 128 per process, and there are 8 processes when >> launching the benchmark. I suppose the 128 comes from the number >> of online CPUs. Please let me know if you need more data. >> >> Cced Yangyu who's the author of this benchmark. > > I mean the benchmark result with default value of llc_aggr_tolerance on Genoa > in comparison to baseline. Knowing number of threads also helps to understand > the impact. > OK. Here are the full test script and corresponding data: pepc pstates config --governor performance pepc pstates config --turbo off pepc cstates config --disable C2 echo 1 > /proc/sys/kernel/numa_balancing echo NO_SCHED_CACHE > /sys/kernel/debug/sched/features make run sleep 5 sync echo SCHED_CACHE > /sys/kernel/debug/sched/features echo 50 > /sys/kernel/debug/sched/llc_overload_pct echo 1 > /sys/kernel/debug/sched/llc_aggr_tolerance make run echo SCHED_CACHE > /sys/kernel/debug/sched/features # to encourage task aggregation as much as possible echo 100 > /sys/kernel/debug/sched/llc_overload_pct echo 100 > /sys/kernel/debug/sched/llc_aggr_tolerance make run # ./launch.sh Host time spent: 51,323ms //baseline Host time spent: 51,741ms //sched_cache default Host time spent: 27,934ms //sched_cache aggressive thanks, Chenyu