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autonuma-benchmark > test machine: 88 threads 2 sockets Intel(R) Xeon(R) Gold 6238M CPU @ 2.10GHz (Cascade Lake) with 128G memory > parameters: > > iterations: 4x > test: numa02_SMT > cpufreq_governor: performance > > > In addition to that, the commit also has significant impact on the following tests: > > +------------------+------------------------------------------------------------------------------------------------+ > | testcase: change | autonuma-benchmark: autonuma-benchmark.numa01.seconds 39.3% regression | > | test machine | 224 threads 2 sockets (Sapphire Rapids) with 256G memory | > | test parameters | cpufreq_governor=performance | > | | iterations=4x | > | | test=numa02_SMT | > +------------------+------------------------------------------------------------------------------------------------+ > | testcase: change | autonuma-benchmark: autonuma-benchmark.numa01.seconds 48.9% regression | > | test machine | 88 threads 2 sockets Intel(R) Xeon(R) Gold 6238M CPU @ 2.10GHz (Cascade Lake) with 128G memory | > | test parameters | cpufreq_governor=performance | > | | debug-setup=no-monitor | > | | iterations=4x | > | | test=numa02_SMT | > +------------------+------------------------------------------------------------------------------------------------+ > [...] Hello, Thanks for the detailed analysis. I have posted a RFC patch to address this issue [1]. (that patch needs windows = 0 initialized FYI if needs to be applied). will be posting RFC V2 soon. Will add your reported-by to that patchset. But one thing to note is [1] will be bringing back *some* of the system overhead of vma scanning. Here are some observations/Clarifications on numa01 test: - numa01 benchmark improvements I got for numascan improvement patchset [2] were based on mmtests' numa01, lets call mmtest_numa01. (some how this is not run in LKP ?) - lkp_numa01 = mmtests' numa01_THREAD_ALLOC case mentioned in the patch[1] With numa scan enhancement patches there is a huge improvement regarding system time overhead of vma scanning since we filter out scanning by tasks which have not accessed VMA. This has benefited mmtest_numa01 However in case of lkp_numa01 we are observing that less PTE updates happening because of filtering. (we can say a corner case of disjoint set vma). This has caused regression you have reported. backup: ---------- lkp_numa01: 3GB allocated memory that is distributed evenly to threads (24MB chunk). 24MB is then bzeroed by each thread 1000 times mmtest_numa01: entire 3GB bzeroed by all threads 50 times [1]. https://lore.kernel.org/lkml/cover.1683033105.git.raghavendra.kt@amd.com/ [2] https://lore.kernel.org/lkml/cover.1677672277.git.raghavendra.kt@amd.com/T/#t Thanks and Regards - Raghu