Hi, I noticed a performance regression of xfs 6.1.27/6.1.23, with the compare to xfs 5.15.110. It is yet not clear whether it is a problem of xfs or lvm2. any guide to troubleshoot it? test case: disk: NVMe PCIe3 SSD *4 LVM: raid0 default strip size 64K. fio -name write-bandwidth -rw=write -bs=1024Ki -size=32Gi -runtime=30 -iodepth 1 -ioengine sync -zero_buffers=1 -direct=0 -end_fsync=1 -numjobs=4 -directory=/mnt/test 6.1.27/6.1.23 fio bw=2623MiB/s (2750MB/s) perf report: Samples: 330K of event 'cycles', Event count (approx.): 120739812790 Overhead Command Shared Object Symbol 31.07% fio [kernel.kallsyms] [k] copy_user_enhanced_fast_string 5.11% fio [kernel.kallsyms] [k] iomap_set_range_uptodate.part.24 3.36% fio [kernel.kallsyms] [k] asm_exc_nmi 3.29% fio [kernel.kallsyms] [k] native_queued_spin_lock_slowpath 2.27% fio [kernel.kallsyms] [k] iomap_write_begin 2.18% fio [kernel.kallsyms] [k] get_page_from_freelist 2.11% fio [kernel.kallsyms] [k] xas_load 2.10% fio [kernel.kallsyms] [k] xas_descend 5.15.110 fio bw=6796MiB/s (7126MB/s) perf report: Samples: 267K of event 'cycles', Event count (approx.): 186688803871 Overhead Command Shared Object Symbol 38.09% fio [kernel.kallsyms] [k] copy_user_enhanced_fast_string 6.76% fio [kernel.kallsyms] [k] iomap_set_range_uptodate 4.40% fio [kernel.kallsyms] [k] xas_load 3.94% fio [kernel.kallsyms] [k] get_page_from_freelist 3.04% fio [kernel.kallsyms] [k] asm_exc_nmi 1.97% fio [kernel.kallsyms] [k] native_queued_spin_lock_slowpath 1.88% fio [kernel.kallsyms] [k] __pagevec_lru_add 1.53% fio [kernel.kallsyms] [k] iomap_write_begin 1.53% fio [kernel.kallsyms] [k] __add_to_page_cache_locked 1.41% fio [kernel.kallsyms] [k] xas_start Best Regards Wang Yugui (wangyugui@xxxxxxxxxxxx) 2023/05/08
