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

[Yu Kuai]

Hi, Song

在 2022/09/01 2:00, Song Liu 写道:
> On Mon, Aug 29, 2022 at 6:03 AM Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> 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
>
> Nice work! Applied to md-next.

Can you drop this version? There are something to improve. I can send a
new version.

Thanks,
Kuai
> Thanks,
> Song
> .