Re: [PATCH -next 0/3] md/raid10: reduce lock contention for io

[Yu Kuai]

Hi!

在 2022/08/29 21:40, Guoqing Jiang 写道:
> 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?

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
> .