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Date: Thu, 19 Jun 2008 11:56:45 -0400
From: Theodore Tso <tytso@mit.edu>
To: Holger Kiehl <Holger.Kiehl@dwd.de>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
       Jan Kara <jack@suse.cz>, Solofo.Ramangalahy@bull.net,
       Nick Dokos <nicholas.dokos@hp.com>, linux-ext4@vger.kernel.org,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Performance of ext4
Message-ID: <20080619155645.GA8582@mit.edu>
Mail-Followup-To: Theodore Tso <tytso@mit.edu>,
	Holger Kiehl <Holger.Kiehl@dwd.de>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	Jan Kara <jack@suse.cz>, Solofo.Ramangalahy@bull.net,
	Nick Dokos <nicholas.dokos@hp.com>, linux-ext4@vger.kernel.org,
	linux-kernel <linux-kernel@vger.kernel.org>
References: <18513.345.553912.449710@frecb006361.adech.frec.bull.fr> <Pine.LNX.4.64.0806121154090.27806@diagnostix.dwd.de> <20080612131928.GB18229@mit.edu> <Pine.LNX.4.64.0806121333480.27806@diagnostix.dwd.de> <20080612180605.GD22481@skywalker> <Pine.LNX.4.64.0806121940020.2974@diagnostix.dwd.de> <Pine.LNX.4.64.0806130753100.7097@diagnostix.dwd.de> <20080616175408.GF3279@atrey.karlin.mff.cuni.cz> <20080616181353.GA20686@skywalker> <Pine.LNX.4.64.0806171001200.6307@diagnostix.dwd.de>
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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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