linux-ext4 - Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

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Message-ID: <20080519223959.GA14602@atrey.karlin.mff.cuni.cz>
Date:	Tue, 20 May 2008 00:39:59 +0200
From:	Jan Kara <jack@...e.cz>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Sandeen <sandeen@...hat.com>,
	Theodore Tso <tytso@....edu>, Andi Kleen <andi@...stfloor.org>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

> On Monday 19 May 2008, Chris Mason wrote:
> >
> > Here's a test workload that corrupts ext3 50% of the time on power fail
> > testing for me.  The machine in this test is my poor dell desktop (3ghz,
> > dual core, 2GB of ram), and the power controller is me walking over and
> > ripping the plug out the back.
> 
> Here's a new version that still gets about corruptions 50% of the time, but 
> does it with fewer files by using longer file names (240 chars instead of 160 
> chars).
> 
> I tested this one with a larger FS (40GB instead of 2GB) and larger log (128MB 
> instead of 32MB).  barrier-test -s 32 -p 1500 was still able to get a 50% 
> corruption rate on the larger FS.
  Hmm, this is worse than I'd have expected :( If it is that bad, I
think we should really enable them by default... I can give your script
a try on my test machine when I get back (which is next week).

								Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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