From: David Newall <davidn@davidnewall.com>
To: jim owens <owens6336@gmail.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
Jeff Garzik <jeff@garzik.org>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
Akira Fujita <a-fujita@rs.jp.nec.com>
Subject: Re: defrag deployment status (was Re: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode)
Date: Wed, 10 Mar 2010 02:49:41 +1030 [thread overview]
Message-ID: <4B96751D.10804@davidnewall.com> (raw)
In-Reply-To: <4B952437.8020607@gmail.com>
jim owens wrote:
> No. Your logic would be correct if rotating disks had
> similar speed at all locations. Current disks are much
> faster at the 0 end than at the middle or highest address.
>
I think my logic is still correct, although I wished I had said "closer
to the middle." In fact, simplistic ideas for placement of files are
unlikely to produce fabulous results (and that includes placing commonly
used files towards the middle of the disk, say at the inside edge of the
outermost zone.) The effort that BSD went to in FFS, placing
directories with files and meta-data in cylinder groups, illustrates
that disk performance is a sophisticated problem.
Why don't we use BSD FFS/FFS2?
next prev parent reply other threads:[~2010-03-09 16:19 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-07 20:32 [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode Christian Borntraeger
2010-03-07 23:27 ` defrag deployment status (was Re: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode) Jeff Garzik
2010-03-08 5:43 ` Eric Sandeen
2010-03-08 7:53 ` Christian Borntraeger
2010-03-08 15:33 ` David Newall
2010-03-08 16:00 ` Christian Borntraeger
2010-03-08 16:22 ` jim owens
2010-03-08 16:31 ` Greg Freemyer
2010-03-08 17:11 ` jim owens
2010-03-09 13:23 ` jim owens
2010-03-08 19:38 ` Valdis.Kletnieks
2010-03-08 20:48 ` jim owens
2010-03-09 16:19 ` David Newall [this message]
2010-03-08 5:47 ` [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode Eric Sandeen
2010-03-08 8:42 ` Akira Fujita
2010-03-12 7:01 ` [PATCH resend] " Christian Borntraeger
2010-04-02 21:48 ` [PATCH] " tytso
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