From: Christoph Hellwig <hch@infradead.org>
To: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Cc: linux-xfs@oss.sgi.com
Subject: Re: Deleting files with extended attributes is dead slow
Date: Fri, 12 Aug 2011 16:47:46 -0400 [thread overview]
Message-ID: <20110812204746.GB30615@infradead.org> (raw)
In-Reply-To: <j23qs9$1c3$1@dough.gmane.org>
On Fri, Aug 12, 2011 at 08:19:53PM +0200, Bernd Schubert wrote:
> Hi there,
>
> with FhGFS we may use extended attributes to store file meta data
> and with ext3/ext4 that also works very well and the rate to create
> files and to write those EAs (create() + fsetxattr() is about 2.5
> to 3 times faster than with a create() + write(). Size of those EA
> data is about 256 bytes depending on the number of storage stripes.
> However, with XFS using extended attributes is *extremely* slow.
> Here are some numbers with ext4 and xfs using a patched [1] bonnie++
Currently XFS uses synchronous transactions when retiring inodes with
xattrs on them. So far I've not actually found a good reason for that,
so I suspect we can remove it. I'll do another audit of it, and will
send you a patch for it after doing basic QA.
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next prev parent reply other threads:[~2011-08-12 20:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-12 18:19 Deleting files with extended attributes is dead slow Bernd Schubert
2011-08-12 20:47 ` Christoph Hellwig [this message]
2011-08-16 16:13 ` Christoph Hellwig
[not found] ` <4E4BBC98.7020501@itwm.fraunhofer.de>
2011-08-17 17:02 ` Christoph Hellwig
2011-08-17 17:39 ` Bernd Schubert
2011-08-18 2:08 ` Dave Chinner
2011-08-18 3:05 ` Dave Chinner
2011-08-22 14:35 ` Christoph Hellwig
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