From: Jan Kara <jack@suse.cz>
To: Eric Sandeen <sandeen@redhat.com>
Cc: Theodore Ts'o <tytso@mit.edu>, Fredrick <fjohnber@zoho.com>,
Ric Wheeler <rwheeler@redhat.com>,
linux-ext4@vger.kernel.org, Andreas Dilger <adilger@dilger.ca>,
wenqing.lz@taobao.com
Subject: Re: ext4_fallocate
Date: Mon, 2 Jul 2012 19:44:21 +0200 [thread overview]
Message-ID: <20120702174421.GM6679@quack.suse.cz> (raw)
In-Reply-To: <4FF1CD5D.8010904@redhat.com>
On Mon 02-07-12 11:33:33, Eric Sandeen wrote:
> On 07/01/2012 10:16 PM, Zheng Liu wrote:
> > Hi Eric,
> >
> > Could you please run this test with 'journal_async_commit' flag. In my
> > previous test, this feature can dramatically improve the performance of
> > uninitialized extent conversion.
> >
> > I have sent an email to do a similar test [1]. In that email, I do a
> > similar test and the journal_async_commit flag quite can improve the
> > performance.
>
> I can try to find time for that, but so far I haven't actually seen any
> severe impact of conversion on a non-debug kernel. And didn't Jan think
> that journal_async_commit was fatally flawed?
Yes, that option is broken and basically unfixable for data=ordered mode
(see http://comments.gmane.org/gmane.comp.file-systems.ext4/30727). For
data=writeback it works fine AFAICT.
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2012-07-02 17:44 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-25 6:42 ext4_fallocate Fredrick
2012-06-25 7:33 ` ext4_fallocate Andreas Dilger
2012-06-28 15:12 ` ext4_fallocate Phillip Susi
2012-06-28 15:23 ` ext4_fallocate Eric Sandeen
2012-06-25 8:51 ` ext4_fallocate Zheng Liu
2012-06-25 19:04 ` ext4_fallocate Fredrick
2012-06-25 19:17 ` ext4_fallocate Theodore Ts'o
2012-06-26 1:23 ` ext4_fallocate Fredrick
2012-06-26 13:13 ` ext4_fallocate Ric Wheeler
2012-06-26 17:30 ` ext4_fallocate Theodore Ts'o
2012-06-26 18:06 ` ext4_fallocate Fredrick
2012-06-26 18:21 ` ext4_fallocate Ric Wheeler
2012-06-26 18:57 ` ext4_fallocate Ted Ts'o
2012-06-26 19:22 ` ext4_fallocate Ric Wheeler
2012-06-26 18:05 ` ext4_fallocate Fredrick
2012-06-26 18:59 ` ext4_fallocate Ted Ts'o
2012-06-26 19:30 ` ext4_fallocate Ric Wheeler
2012-06-26 19:57 ` ext4_fallocate Eric Sandeen
2012-06-26 20:44 ` ext4_fallocate Eric Sandeen
2012-06-27 15:14 ` ext4_fallocate Eric Sandeen
2012-06-27 19:30 ` ext4_fallocate Theodore Ts'o
2012-06-27 23:02 ` ext4_fallocate Eric Sandeen
2012-06-28 11:27 ` ext4_fallocate Ric Wheeler
2012-06-29 19:02 ` ext4_fallocate Andreas Dilger
2012-07-02 3:03 ` ext4_fallocate Zheng Liu
2012-06-28 12:48 ` ext4_fallocate Theodore Ts'o
2012-07-02 3:16 ` ext4_fallocate Zheng Liu
2012-07-02 16:33 ` ext4_fallocate Eric Sandeen
2012-07-02 17:44 ` Jan Kara [this message]
2012-07-02 17:48 ` ext4_fallocate Ric Wheeler
2012-07-03 17:41 ` ext4_fallocate Zheng Liu
2012-07-03 17:57 ` ext4_fallocate Zach Brown
2012-07-04 2:23 ` ext4_fallocate Zheng Liu
2012-07-02 18:01 ` ext4_fallocate Theodore Ts'o
2012-07-03 9:30 ` ext4_fallocate Jan Kara
2012-07-04 1:15 ` ext4_fallocate Phillip Susi
2012-07-04 2:36 ` ext4_fallocate Zheng Liu
2012-07-04 3:06 ` ext4_fallocate Phillip Susi
2012-07-04 3:48 ` ext4_fallocate Zheng Liu
2012-07-04 12:20 ` ext4_fallocate Ric Wheeler
2012-07-04 13:25 ` ext4_fallocate Zheng Liu
2012-06-26 13:06 ` ext4_fallocate Eric Sandeen
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