Raghavendra K T <raghavendra.kt@xxxxxxx> writes: > On 4/3/2023 10:52 AM, Ankur Arora wrote: >> This series introduces multi-page clearing for hugepages. > *Milan* mm/clear_huge_page x86/clear_huge_page change > (GB/s) (GB/s) > pg-sz=2MB 12.24 17.54 +43.30% > pg-sz=1GB 17.98 37.24 +107.11% > > > Hello Ankur, > > 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 <test> > > 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? > Full perfstat info > > page size = 2M mm/clear_huge_page > > Performance counter stats for 'numactl -m 0 -N 0 map_hugetlb_2M' (10 runs): > > 5,434.71 msec task-clock # 0.996 CPUs utilized > ( +- 0.55% ) > 8 context-switches # 1.466 /sec > ( +- 4.66% ) > 0 cpu-migrations # 0.000 /sec > 32,918 page-faults # 6.034 K/sec > ( +- 0.00% ) > 16,977,242,482 cycles # 3.112 GHz > ( +- 0.04% ) (35.70%) > 1,961,724 stalled-cycles-frontend # 0.01% frontend cycles > idle ( +- 1.09% ) (35.72%) > 35,685,674 stalled-cycles-backend # 0.21% backend cycles idle > ( +- 3.48% ) (35.74%) > 1,038,327,182 instructions # 0.06 insn per cycle > # 0.04 stalled cycles per > insn ( +- 0.38% ) > (35.75%) > 221,409,216 branches # 40.584 M/sec > ( +- 0.36% ) (35.75%) > 350,730 branch-misses # 0.16% of all branches > ( +- 1.18% ) (35.75%) > 2,520,888,779 L1-dcache-loads # 462.077 M/sec > ( +- 0.03% ) (35.73%) > 1,094,178,209 L1-dcache-load-misses # 43.46% of all L1-dcache > accesses ( +- 0.02% ) (35.71%) > 67,751,730 L1-icache-loads # 12.419 M/sec > ( +- 0.11% ) (35.70%) > 271,118 L1-icache-load-misses # 0.40% of all L1-icache > accesses ( +- 2.55% ) (35.70%) > 506,635 dTLB-loads # 92.866 K/sec > ( +- 3.31% ) (35.70%) > 237,385 dTLB-load-misses # 43.64% of all dTLB cache > accesses ( +- 7.00% ) (35.69%) > 268 iTLB-load-misses # 6700.00% of all iTLB cache > accesses ( +- 13.86% ) (35.70%) > > 5.4567 +- 0.0300 seconds time elapsed ( +- 0.55% ) > > page size = 2M x86/clear_huge_page > Performance counter stats for 'numactl -m 0 -N 0 map_hugetlb_2M' (10 runs): > > 2,780.69 msec task-clock # 1.039 CPUs utilized > ( +- 1.03% ) > 3 context-switches # 1.121 /sec > ( +- 21.34% ) > 0 cpu-migrations # 0.000 /sec > 32,918 page-faults # 12.301 K/sec > ( +- 0.00% ) > 8,143,619,771 cycles # 3.043 GHz > ( +- 0.25% ) (35.62%) > 2,024,872 stalled-cycles-frontend # 0.02% frontend cycles > idle ( +-320.93% ) (35.66%) > 717,198,728 stalled-cycles-backend # 8.82% backend cycles idle > ( +- 8.26% ) (35.69%) > 606,549,334 instructions # 0.07 insn per cycle > # 1.39 stalled cycles per > insn ( +- 0.23% ) > (35.73%) > 108,856,550 branches # 40.677 M/sec > ( +- 0.24% ) (35.76%) > 202,490 branch-misses # 0.18% of all branches > ( +- 3.58% ) (35.78%) > 2,348,818,806 L1-dcache-loads # 877.701 M/sec > ( +- 0.03% ) (35.78%) > 1,081,562,988 L1-dcache-load-misses # 46.04% of all L1-dcache > accesses ( +- 0.01% ) (35.78%) > <not supported> LLC-loads > <not supported> LLC-load-misses > 43,411,167 L1-icache-loads # 16.222 M/sec > ( +- 0.19% ) (35.77%) > 273,042 L1-icache-load-misses # 0.64% of all L1-icache > accesses ( +- 4.94% ) (35.76%) > 834,482 dTLB-loads # 311.827 K/sec > ( +- 9.73% ) (35.72%) > 437,343 dTLB-load-misses # 65.86% of all dTLB cache > accesses ( +- 8.56% ) (35.68%) > 0 iTLB-loads # 0.000 /sec > (35.65%) > 160 iTLB-load-misses # 1777.78% of all iTLB cache > accesses ( +- 15.82% ) (35.62%) > > 2.6774 +- 0.0287 seconds time elapsed ( +- 1.07% ) > > page size = 1G mm/clear_huge_page > Performance counter stats for 'numactl -m 0 -N 0 map_hugetlb_1G' (10 runs): > > 2,625.24 msec task-clock # 0.993 CPUs utilized > ( +- 0.23% ) > 4 context-switches # 1.513 /sec > ( +- 4.49% ) > 1 cpu-migrations # 0.378 /sec > 214 page-faults # 80.965 /sec > ( +- 0.13% ) > 8,178,624,349 cycles # 3.094 GHz > ( +- 0.23% ) (35.65%) > 2,942,576 stalled-cycles-frontend # 0.04% frontend cycles > idle ( +- 75.22% ) (35.69%) > 7,117,425 stalled-cycles-backend # 0.09% backend cycles idle > ( +- 3.79% ) (35.73%) > 454,521,647 instructions # 0.06 insn per cycle > # 0.02 stalled cycles per > insn ( +- 0.10% ) > (35.77%) > 113,223,853 branches # 42.837 M/sec > ( +- 0.08% ) (35.80%) > 84,766 branch-misses # 0.07% of all branches > ( +- 5.37% ) (35.80%) > 2,294,528,890 L1-dcache-loads # 868.111 M/sec > ( +- 0.02% ) (35.81%) > 1,075,907,551 L1-dcache-load-misses # 46.88% of all L1-dcache > accesses ( +- 0.02% ) (35.78%) > 26,167,323 L1-icache-loads # 9.900 M/sec > ( +- 0.24% ) (35.74%) > 139,675 L1-icache-load-misses # 0.54% of all L1-icache > accesses ( +- 0.37% ) (35.70%) > 3,459 dTLB-loads # 1.309 K/sec > ( +- 12.75% ) (35.67%) > 732 dTLB-load-misses # 19.71% of all dTLB cache > accesses ( +- 26.61% ) (35.62%) > 11 iTLB-load-misses # 192.98% of all iTLB cache > accesses ( +-238.28% ) (35.62%) > > 2.64452 +- 0.00600 seconds time elapsed ( +- 0.23% ) > > > page size = 1G x86/clear_huge_page > Performance counter stats for 'numactl -m 0 -N 0 map_hugetlb_1G' (10 runs): > > 1,009.09 msec task-clock # 0.998 CPUs utilized > ( +- 0.06% ) > 2 context-switches # 1.980 /sec > ( +- 23.63% ) > 1 cpu-migrations # 0.990 /sec > 214 page-faults # 211.887 /sec > ( +- 0.16% ) > 3,154,980,463 cycles # 3.124 GHz > ( +- 0.06% ) (35.77%) > 145,051 stalled-cycles-frontend # 0.00% frontend cycles > idle ( +- 6.26% ) (35.78%) > 730,087,143 stalled-cycles-backend # 23.12% backend cycles idle > ( +- 9.75% ) (35.78%) > 45,813,391 instructions # 0.01 insn per cycle > # 18.51 stalled cycles per > insn ( +- 1.00% ) > (35.78%) > 8,498,282 branches # 8.414 M/sec > ( +- 1.54% ) (35.78%) > 63,351 branch-misses # 0.74% of all branches > ( +- 6.70% ) (35.69%) > 29,135,863 L1-dcache-loads # 28.848 M/sec > ( +- 5.67% ) (35.68%) > 8,537,280 L1-dcache-load-misses # 28.66% of all L1-dcache > accesses ( +- 10.15% ) (35.68%) > 1,040,087 L1-icache-loads # 1.030 M/sec > ( +- 1.60% ) (35.68%) > 9,147 L1-icache-load-misses # 0.85% of all L1-icache > accesses ( +- 6.50% ) (35.67%) > 1,084 dTLB-loads # 1.073 K/sec > ( +- 12.05% ) (35.68%) > 431 dTLB-load-misses # 40.28% of all dTLB cache > accesses ( +- 43.46% ) (35.68%) > 16 iTLB-load-misses # 0.00% of all iTLB cache > accesses ( +- 40.54% ) (35.68%) > > 1.011281 +- 0.000624 seconds time elapsed ( +- 0.06% ) > > Please feel free to add > > Tested-by: Raghavendra K T <raghavendra.kt@xxxxxxx> Thanks Ankur > Will come back with further observations on patch/performance if any
