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Impact of atime updates on XFS

To: linux-xfs@xxxxxxxxxxx
Subject: Impact of atime updates on XFS
From: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Date: Wed, 8 Aug 2007 14:23:34 +0200
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Hello!

Today, I read about the impact of atime updates on ext3 and possible
approaches on how to reduce that impact by using relatime, a modified 
version of relatime - Ingo Molnar posted a patch - or two different 
states of dirty inodes, atime dirty inodes which do not need to be 
flushed soon and dirty inodes with other changes which should be flushed 
soon[1].

What would be the impact of atime versus noatime on XFS? What is the
recommended setting for XFS? Are there any plans to implement relatime
logic - maybe even the improved one by Ingo Molnar - into XFS?

I just remounted my partitions on the notebook and my workstation with 
noatime for testing and I have the feeling that it indeed does help. What 
are experiences of others?

[1] http://kerneltrap.org/node/14148

Regards,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7


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