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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <691f9d94-f650-0f04-2d49-74fe84c24bfe@linux.dev>
Date:   Mon, 29 Aug 2022 21:40:51 +0800
From:   Guoqing Jiang <guoqing.jiang@...ux.dev>
To:     Yu Kuai <yukuai1@...weicloud.com>, song@...nel.org
Cc:     linux-raid@...r.kernel.org, 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 8/29/22 9:14 PM, Yu Kuai 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

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?

Thanks,
Guoqing