linux-ext4 - Re: Ext4 devel interlock meeting minutes (April 23, 2007)

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Date:	Tue, 24 Apr 2007 16:04:10 +0200
From:	Valerie Clement <valerie.clement@...l.net>
To:	Alex Tomas <alex@...sterfs.com>
Cc:	Avantika Mathur <mathur@...ux.vnet.ibm.com>,
	linux-ext4@...r.kernel.org, Mingming Cao <cmm@...ibm.com>
Subject: Re: Ext4 devel interlock meeting minutes (April 23, 2007)

Alex Tomas wrote:

>> - Large file deletion
>>    - Valerie had recently tested large file deletion on ext3/4, but 
>> did not see the expected performance gain with ext4 due to compact 
>> metadata when using extents.
> 
> any details?
> 

Ok, I found my mistake. There was a typo in my test script and the 
pagecache was not flushed between the file creation and the deletion.

Here are the results I obtain with a 2.6.17-rc7 kernel to delete a 100GB 
file:

ext3 : real  2m35.048s    user  0m0.000s     sys  0m6.424s
ext4 : real  0m11.160s    user  0m0.000s     sys  0m5.532s
xfs :  real  0m0.377s     user  0m0.004s     sys  0m0.004s

The performance gain with ext4 is much larger when running a good test...
Sorry the wrong information,

    Valérie


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