Hi!

在 2022/08/29 21:40, Guoqing Jiang 写道:

On 8/29/22 9:14 PM, Yu Kuai wrote:

quoted

From: Yu Kuai <redacted>

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.

quoted

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?

I tried to test with Intel(R) Xeon(R) Platinum 8380 CPU @ 2.30GHz,

before this patchset: 7.0 GiB/s
after this patchset : 9.3 GiB/s

Thanks,
Kuai

Thanks,
Guoqing
.