On 8/29/22 9:14 PM, Yu Kuai wrote:
From: Yu Kuai <yukuai3@xxxxxxxxxx> patch 1 is a small problem found by code review. patch 2 avoid holding resync_lock in fast path. patch 3 avoid holding lock in wake_up() in fast path. Test environment: Architecture: aarch64 Cpu: Huawei KUNPENG 920, there are four numa nodes Raid10 initialize: mdadm --create /dev/md0 --level 10 --bitmap none --raid-devices 4 /dev/nvme0n1 /dev/nvme1n1 /dev/nvme2n1 /dev/nvme3n1 Test cmd: fio -name=0 -ioengine=libaio -direct=1 -group_reporting=1 -randseed=2022 -rwmixread=70 -refill_buffers -filename=/dev/md0 -numjobs=16 -runtime=60s -bs=4k -iodepth=256 -rw=randread Test result: before this patchset: 2.9 GiB/s after this patchset: 6.6 Gib/s
Impressive! Pls try mdadm test suites too to avoid regression.
Please noted that in kunpeng-920, memory access latency is very bad accross nodes compare to local node, and in other architecture performance improvement might not be significant.
By any chance can someone try with x64? Thanks, Guoqing
