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

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Date:   Wed, 08 May 2019 15:56:59 +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

"Huang, Ying" <ying.huang@...el.com> writes:

> 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?

Ping

Best Regards,
Huang, Ying