From: Valdis.Kletnieks@vt.edu
To: jim owens <owens6336@gmail.com>
Cc: David Newall <davidn@davidnewall.com>,
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: Mon, 08 Mar 2010 14:38:50 -0500 [thread overview]
Message-ID: <4987.1268077130@localhost> (raw)
In-Reply-To: Your message of "Mon, 08 Mar 2010 11:22:15 EST." <4B952437.8020607@gmail.com>
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On Mon, 08 Mar 2010 11:22:15 EST, jim owens said:
> 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.
>
> It is not unusual to see 2x difference in transfer speed
> so you always want the important stuff as low as possible.
On the flip side, seek time is so much larger than the time spent
actually reading that minimizing the seeks will improve total throughput
more. Sure, maybe you spend 0.05ms reading instead of 0.1ms - but if
the seek took 0.75ms rather than 0.5ms you're still in the hole.
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next prev parent reply other threads:[~2010-03-08 19:39 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 [this message]
2010-03-08 20:48 ` jim owens
2010-03-09 16:19 ` David Newall
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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