linux-kernel - Re: Performance of ext4

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Message-ID: <20080619155645.GA8582@mit.edu>
Date:	Thu, 19 Jun 2008 11:56:45 -0400
From:	Theodore Tso <tytso@....edu>
To:	Holger Kiehl <Holger.Kiehl@....de>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Jan Kara <jack@...e.cz>, Solofo.Ramangalahy@...l.net,
	Nick Dokos <nicholas.dokos@...com>, linux-ext4@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Performance of ext4

On Tue, Jun 17, 2008 at 11:42:36AM +0000, Holger Kiehl wrote:
> Note how the size of file results.24033.helena.dwd.de changes from
> 9230 before the test to 8208 bytes after the test. Also note the
> date both have the same timestamp "2008-06-17 04:35". I have made a
> copy of results.24033.helena.dwd.de before the test and compared it
> with that after the test. The file is just truncated by 1022 bytes
> and there is no garbage.

So the corruption is always a truncation, correct?

Did you notice the problem with ext4 w/o the patch queue?  I have a
suspicion that the problem may have been introduced by the delayed
allocation code, but I don't have hard evidence.  When you rerun your
benchmark (which seems to be the closest thing we have to a
reproduction case), it would be interesting to know if the problem
goes away with -o nodelalloc (again, it would localize where we need
to look).

Thanks, regards,

						- Ted
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