From: Richard Ems <richard.ems@cape-horn-eng.com>
To: xfs@oss.sgi.com
Subject: Re: XFS unlink still slow on 3.1.9 kernel ?
Date: Wed, 15 Feb 2012 13:07:45 +0100 [thread overview]
Message-ID: <4F3BA011.8010006@cape-horn-eng.com> (raw)
In-Reply-To: <20120214194535.GB7399@infradead.org>
On 02/14/2012 08:45 PM, Christoph Hellwig wrote:
> On Tue, Feb 14, 2012 at 01:32:00PM +0100, Richard Ems wrote:
>>> You won't if the directory traversal is seek bound and that is the
>>> limiting factor for performance.
>>
>> *Seek bound*? *When* is the directory traversal *seek bound*?
>
> You read the inode for the directory first, then the external attribute
> block for the ACLs, then if the directory isn't tiny you'll start reading
> directory blocks, the more the larger the directory is, and if the
> filesystem is close to beeing full they often will be non-contiguous.
> Then you read the inode for each file/directory in it, then the external
> attribute block, then the extent list, and so on.
Ok, got it.
Many thanks,
Richard
--
Richard Ems mail: Richard.Ems@Cape-Horn-Eng.com
Cape Horn Engineering S.L.
C/ Dr. J.J. Dómine 1, 5º piso
46011 Valencia
Tel : +34 96 3242923 / Fax 924
http://www.cape-horn-eng.com
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next prev parent reply other threads:[~2012-02-15 12:07 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-13 16:57 XFS unlink still slow on 3.1.9 kernel ? Richard Ems
2012-02-13 17:08 ` Christoph Hellwig
2012-02-13 17:11 ` Richard Ems
2012-02-13 17:15 ` Christoph Hellwig
2012-02-13 17:26 ` Richard Ems
2012-02-13 17:29 ` Christoph Hellwig
2012-02-13 17:53 ` Richard Ems
2012-02-13 18:02 ` Christoph Hellwig
2012-02-13 18:06 ` Richard Ems
2012-02-13 18:10 ` Christoph Hellwig
2012-02-13 18:18 ` Richard Ems
2012-02-13 18:48 ` Richard Ems
2012-02-13 21:16 ` Christoph Hellwig
2012-02-14 5:31 ` Stan Hoeppner
2012-02-14 9:48 ` Richard Ems
2012-02-14 19:43 ` Christoph Hellwig
2012-02-14 9:49 ` Richard Ems
2012-02-14 10:54 ` Richard Ems
2012-02-14 11:44 ` Richard Ems
2012-02-14 0:09 ` Dave Chinner
2012-02-14 12:32 ` Richard Ems
2012-02-14 19:45 ` Christoph Hellwig
2012-02-15 12:07 ` Richard Ems [this message]
2012-02-15 1:27 ` Dave Chinner
2012-02-15 12:07 ` Richard Ems
-- strict thread matches above, loose matches on Subject: below --
2012-02-14 13:02 Richard Ems
[not found] ` <4F3AA191.9030606@mnsu.edu>
2012-02-14 18:12 ` Richard Ems
2012-02-14 19:07 ` Christoph Hellwig
2012-02-15 12:48 ` Richard Ems
2012-02-14 23:10 ` Stan Hoeppner
2012-02-15 15:54 ` Richard Ems
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