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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: kXyTQP9WbYGcGqfoCsnqBb46EGeGFdyJiJimkMpRe7yjV233bBSp0cbm0/b1/+bOjAeiELPf77u8xyY7Cp747kZuzAxRXyMLxmqbOuyJ/KE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB4975 X-OriginatorOrg: intel.com Hi, 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. Reinette