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From:   NeilBrown <neilb@suse.com>
To:     kernel test robot <rong.a.chen@intel.com>
Date:   Mon, 08 Apr 2019 17:45:50 +1000
Cc:     Jens Axboe <axboe@kernel.dk>, Xiao Ni <xni@redhat.com>,
        Song Liu <songliubraving@fb.com>,
        LKML <linux-kernel@vger.kernel.org>, Jens Axboe <axboe@fb.com>,
        lkp@01.org
Subject: Re: [MD] 4bc034d353: aim7.jobs-per-min -86.0% regression
In-Reply-To: <20190408071204.GG11264@shao2-debian>
References: <20190408071204.GG11264@shao2-debian>
Message-ID: <875zrpym6p.fsf@notabene.neil.brown.name>
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On Mon, Apr 08 2019, kernel test robot wrote:

> Greeting,
>
> FYI, we noticed a -86.0% regression of aim7.jobs-per-min due to commit:

That is expected.  The following commit
  2bc13b83e6298486371761de503faeffd15b7534
should restore the performance.

NeilBrown


>
>
> commit: 4bc034d35377196c854236133b07730a777c4aba ("Revert "MD: fix lock contention for flush bios"")
> https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git for-5.2/block
>
> in testcase: aim7
> on test machine: 40 threads Intel(R) Xeon(R) CPU E5-2690 v2 @ 3.00GHz with 384G memory
> with following parameters:
>
> 	disk: 4BRD_12G
> 	md: RAID0
> 	fs: xfs
> 	test: sync_disk_rw
> 	load: 300
> 	cpufreq_governor: performance
>
> test-description: AIM7 is a traditional UNIX system level benchmark suite which is used to test and measure the performance of multiuser system.
> test-url: https://sourceforge.net/projects/aimbench/files/aim-suite7/
>
>

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