linux-kernel - Re: [LKP] [btrfs] 302167c50b: fio.write_bw

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Date:   Fri, 26 Apr 2019 14:14:11 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Josef Bacik <josef@...icpanda.com>
Cc:     kernel test robot <rong.a.chen@...el.com>,
        David Sterba <dsterba@...e.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        "lkp\@01.org" <lkp@...org>, LKML <linux-kernel@...r.kernel.org>,
        Qu Wenruo <wqu@...e.com>
Subject: Re: [LKP] [btrfs]  302167c50b:  fio.write_bw_MBps -12.4% regression

Hi, Josef,

kernel test robot <rong.a.chen@...el.com> writes:

> Greeting,
>
> FYI, we noticed a -12.4% regression of fio.write_bw_MBps due to commit:
>
>
> commit: 302167c50b32e7fccc98994a91d40ddbbab04e52 ("btrfs: don't end the transaction for delayed refs in throttle")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git pending-fixes
>
> in testcase: fio-basic
> on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G memory
> with following parameters:
>
> 	runtime: 300s
> 	nr_task: 8t
> 	disk: 1SSD
> 	fs: btrfs
> 	rw: randwrite
> 	bs: 4k
> 	ioengine: sync
> 	test_size: 400g
> 	cpufreq_governor: performance
> 	ucode: 0xb00002e
>
> test-description: Fio is a tool that will spawn a number of threads or processes doing a particular type of I/O action as specified by the user.
> test-url: https://github.com/axboe/fio
>
>

Do you have time to take a look at this regression?

Best Regards,
Huang, Ying