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From: Christian Rohmann <crohmann@netcologne.de>
To: Qu Wenruo <quwenruo@cn.fujitsu.com>,
	John Ettedgui <john.ettedgui@gmail.com>,
	Austin S Hemmelgarn <ahferroin7@gmail.com>
Cc: btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: mount btrfs takes 30 minutes, btrfs check runs out of memory
Date: Fri, 15 Jul 2016 13:29:24 +0200	[thread overview]
Message-ID: <d14c14d2-79d3-222b-59e2-ae8b38c7f2d4@netcologne.de> (raw)
In-Reply-To: <126f9f09-4e28-3c12-5384-63032e17942f@cn.fujitsu.com>

Hey Qu, all

On 07/15/2016 05:56 AM, Qu Wenruo wrote:
> 
> The good news is, we have patch to slightly speedup the mount, by
> avoiding reading out unrelated tree blocks.
> 
> In our test environment, it takes 15% less time to mount a fs filled
> with 16K files(2T used space).
> 
> https://patchwork.kernel.org/patch/9021421/

I have a 30TB RAID6 filesystem with compression on and I've seen mount
times of up to 20 minutes (!).

I don't want to sound unfair, but 15% improvement is good, but not in
the league where BTRFS needs to be.
Do I understand you comments correctly that further improvement would
result in a change of the on-disk format?



Thanks and with regards

Christian

  parent reply	other threads:[~2016-07-15 11:34 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAJ3TwYQXqUZiKhYc5rciTmvGX1RLkHnkQb5SSYAJ7AD+kbudag@mail.gmail.com>
2015-07-31  2:34 ` mount btrfs takes 30 minutes, btrfs check runs out of memory Qu Wenruo
2015-07-31  4:10   ` John Ettedgui
2015-08-02  5:44     ` Georgi Georgiev
     [not found]   ` <CAJ3TwYRN+1tJY+paz=qZT0_XP=r9CcTKbBgX_kZRFOWj8vSK=w@mail.gmail.com>
2015-07-31  4:52     ` Qu Wenruo
     [not found]       ` <CAJ3TwYR5g-JhjmGnZUXqLXc7qV1_=AN5_6sj54JQODbtgG9Aag@mail.gmail.com>
2015-07-31  5:40         ` Qu Wenruo
2015-07-31  5:45           ` John Ettedgui
2015-08-01  4:35             ` John Ettedgui
2015-08-01 10:05               ` Russell Coker
2015-08-04  1:39               ` Qu Wenruo
2015-08-04  1:55                 ` John Ettedgui
2015-08-04  2:31                   ` John Ettedgui
2015-08-04  3:01                   ` Qu Wenruo
2015-08-04  4:58                     ` John Ettedgui
2015-08-04  6:47                       ` Duncan
2015-08-04 11:28                       ` Austin S Hemmelgarn
2015-08-04 17:36                         ` John Ettedgui
2015-08-05 11:30                           ` Austin S Hemmelgarn
2015-08-13 22:38                             ` Vincent Olivier
2015-08-13 23:19                               ` Chris Murphy
2015-08-14  0:30                                 ` Duncan
2015-08-14  2:42                                   ` Vincent Olivier
2015-08-18 17:36                                     ` Vincent Olivier
2015-08-14  2:39                                 ` Vincent Olivier
     [not found]                             ` <CAJ3TwYSW+SvbBrh1u_x+c3HTRx03qSR6BoH5cj_VzCXxZYv6EA@mail.gmail.com>
2016-07-15  3:56                               ` Qu Wenruo
     [not found]                                 ` <CAJ3TwYRXwDVVfT0TRRiM9dEw-7TvY8qG=WvMYKczZOv6wkFWAQ@mail.gmail.com>
2016-07-15  5:24                                   ` Qu Wenruo
2016-07-15  6:56                                     ` Kai Krakow
     [not found]                                     ` <CAJ3TwYSTnQfj=qmBLtnmtXQKexMMD4x=9Gk3p3anf4uF+G26kw@mail.gmail.com>
     [not found]                                       ` <CAJ3TwYTnMPVwkrZEU-=Q_Nq+9Bn0vM3z+EFC8RP=RTyaufSoqw@mail.gmail.com>
2016-07-18  1:13                                         ` Qu Wenruo
     [not found]                                           ` <CAJ3TwYRpc_R-wVur0T6+Uy_aPVXTGpvp_ag1Ar9K2HoB0H1ySQ@mail.gmail.com>
2016-07-18  8:41                                             ` Qu Wenruo
     [not found]                                               ` <CAJ3TwYRH8JVkuv2Hu7FYb+BSwKGrq1spx079zwOF_FO1y=9NFA@mail.gmail.com>
2016-07-18  9:07                                                 ` Qu Wenruo
2016-07-18 15:31                                                   ` Duncan
     [not found]                                                   ` <CAJ3TwYS6UTkWf=PNku3RG7hPrXMKz3yhk2WqCRLix4v_VwgrmA@mail.gmail.com>
2016-07-21  8:10                                                     ` Qu Wenruo
     [not found]                                                       ` <CAJ3TwYQ47SVpbO1Pb-TWjhaTCCpMFFmijwTgmV8=7+1_a6_3Ww@mail.gmail.com>
2016-07-21  8:19                                                         ` Qu Wenruo
2016-07-21 15:47                                                           ` Graham Cobb
2017-04-10  0:52                                                             ` Qu Wenruo
2018-02-13 10:21                                                           ` John Ettedgui
2018-02-13 11:04                                                             ` Qu Wenruo
2018-02-13 11:25                                                               ` John Ettedgui
2018-02-13 11:40                                                                 ` Qu Wenruo
2018-02-13 12:06                                                                   ` John Ettedgui
2018-02-13 12:46                                                                     ` Qu Wenruo
2018-02-13 12:52                                                                       ` John Ettedgui
2018-02-13 12:26                                                                   ` Holger Hoffstätte
2018-02-13 12:54                                                                     ` Qu Wenruo
2018-02-13 16:24                                                                       ` Holger Hoffstätte
2018-02-14  0:43                                                                         ` Qu Wenruo
2016-07-15 11:29                                 ` Christian Rohmann [this message]
2016-07-16 23:53                                   ` Qu Wenruo
2016-07-18 13:42                                     ` Josef Bacik
2016-07-19  0:35                                       ` Qu Wenruo
2016-07-25 13:01                                       ` David Sterba
2016-07-25 13:38                                         ` Josef Bacik
2015-08-04 14:38                     ` Chris Murphy
2015-07-29  5:46 Georgi Georgiev
2015-07-29  6:19 ` Qu Wenruo

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