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

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Date:   Wed, 31 Aug 2022 11:00:05 -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>, yukuai3@...wei.com,
        yi.zhang@...wei.com
Subject: Re: [PATCH -next 0/3] md/raid10: reduce lock contention for io

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.

Thanks,
Song