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>> >> Was able to test your patches. To summarize, am seeing 2x-3x perf >> improvement for 2M, 1GB base hugepage sizes. > > Great. Thanks Raghavendra. > >> SUT: Genoa AMD EPYC >> Thread(s) per core: 2 >> Core(s) per socket: 128 >> Socket(s): 2 >> >> NUMA: >> NUMA node(s): 2 >> NUMA node0 CPU(s): 0-127,256-383 >> NUMA node1 CPU(s): 128-255,384-511 >> >> Test: Use mmap(MAP_HUGETLB) to demand a fault on 64GB region (NUMA node0), for >> both base-hugepage-size=2M and 1GB >> >> perf stat -r 10 -d -d numactl -m 0 -N 0 >> >> time in seconds elapsed (average of 10 runs) (lower = better) >> >> Result: >> page-size mm/clear_huge_page x86/clear_huge_page >> 2M 5.4567 2.6774 >> 1G 2.64452 1.011281 > > So translating into BW, for Genoa we have: > > page-size mm/clear_huge_page x86/clear_huge_page > 2M 11.74 23.97 > 1G 24.24 63.36 > > That's a pretty good bump over Milan: > >> *Milan* mm/clear_huge_page x86/clear_huge_page >> (GB/s) (GB/s) >> pg-sz=2MB 12.24 17.54 >> pg-sz=1GB 17.98 37.24 > > Btw, are these numbers with boost=1? > Yes it is. Also a note about config. I had not enabled GCOV/LOCKSTAT related config because I faced some issues.