linux-ext4 - Re: ext4

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Message-ID: <20120702174421.GM6679@quack.suse.cz>
Date:	Mon, 2 Jul 2012 19:44:21 +0200
From:	Jan Kara <jack@...e.cz>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Theodore Ts'o <tytso@....edu>, Fredrick <fjohnber@...o.com>,
	Ric Wheeler <rwheeler@...hat.com>, linux-ext4@...r.kernel.org,
	Andreas Dilger <adilger@...ger.ca>, wenqing.lz@...bao.com
Subject: Re: ext4_fallocate

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@...e.cz>
SUSE Labs, CR
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