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

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Date:   Fri, 9 Sep 2022 07:45:47 -0700
From:   Song Liu <song@...nel.org>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     linux-raid <linux-raid@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, yi.zhang@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next 0/3] md/raid10: reduce lock contention for io

On Fri, Sep 2, 2022 at 11:08 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> Hi, Song
>
> 在 2022/09/01 2:00, Song Liu 写道:
> > On Mon, Aug 29, 2022 at 6:03 AM Yu Kuai <yukuai1@...weicloud.com> wrote:
> >>
> >> From: Yu Kuai <yukuai3@...wei.com>
> >>
> >> 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.

Sure, I will drop it from md-next.

Song