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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: T4ldz93uMSvvXwO8pMUqSZlfKwbab6eqMpLlUt//laxoRigohdjVwV7aHwMgeRyU2utzsTLe7fM7iXgLDUEtLqTU3eO08rqYgeNP7dxizfQ= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR11MB6317 X-OriginatorOrg: intel.com Hi Oliver, On 3/10/25 6:21 PM, Oliver Sang wrote: > On Mon, Mar 10, 2025 at 02:17:51PM -0700, Reinette Chatre wrote: >> On 3/10/25 7:06 AM, kernel test robot wrote: >>> >>> >>> Hello, >>> >>> kernel test robot noticed a 18.4% improvement of will-it-scale.per_process_ops on: >>> >>> >>> commit: 0021800a465d495a536265c52f8a031da43948ed ("x86/resctrl: Use schema type to determine the schema format string") >>> https://git.kernel.org/cgit/linux/kernel/git/morse/linux.git mpam/move_to_fs/v7_bare >>> >>> testcase: will-it-scale >>> config: x86_64-rhel-9.4 >>> compiler: gcc-12 >>> test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 512G memory >>> parameters: >>> >>> nr_task: 100% >>> mode: process >>> test: signal1 >>> cpufreq_governor: performance >>> >>> >>> In addition to that, the commit also has significant impact on the following tests: >>> >>> +------------------+---------------------------------------------------------------------------------------------+ >>> | testcase: change | stress-ng: stress-ng.usersyscall.ops_per_sec 18.0% improvement | >>> | test machine | 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 512G memory | >>> | test parameters | cpufreq_governor=performance | >>> | | nr_threads=100% | >>> | | test=usersyscall | >>> | | testtime=60s | >>> +------------------+---------------------------------------------------------------------------------------------+ >>> >>> >>> >>> >>> Details are as below: >>> --------------------------------------------------------------------------------------------------> >>> >>> >>> The kernel config and materials to reproduce are available at: >>> https://download.01.org/0day-ci/archive/20250310/202503102156.d70c4800-lkp@intel.com >>> >>> ========================================================================================= >>> compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase: >>> gcc-12/performance/x86_64-rhel-9.4/process/100%/debian-12-x86_64-20240206.cgz/lkp-spr-2sp4/signal1/will-it-scale >>> >>> commit: >>> a13ae432a6 ("x86/resctrl: Use schema type to determine how to parse schema values") >>> 0021800a46 ("x86/resctrl: Use schema type to determine the schema format string") >>> >> >> It is surprising to me that these commits make a difference in these workloads. I searched around for resctrl in >> https://github.com/intel/lkp-tests but is seems as though it runs the resctrl selftests only and do not >> use resctrl as part of any tests reported here. From what I understand, by not even mounting resctrl, these tests >> (a) do not exercise these code paths, and (b) do not use resctrl to control resources allocated for these workloads. > > thanks a lot for education! this could be an alignment issue. > > since we found similar performanance impacts on different cases, so made out > the report FYI. seems a false positive. sorry about cost your time to check. > I think it is important to understand this behavior, but unfortunately I cannot explain it by considering the patches identified. resctrl can only be built into the kernel so indeed may impact alignment. Reinette