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    SubjectRe: [PATCH -next 0/3] md/raid10: reduce lock contention for io
    On Mon, Aug 29, 2022 at 6:03 AM Yu Kuai <yukuai1@huaweicloud.com> wrote:
    >
    > From: Yu Kuai <yukuai3@huawei.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

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