linux-kernel - Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)

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Message-ID: <483E4F36.8050902@ziu.info>
Date:	Thu, 29 May 2008 08:37:42 +0200
From:	Michal Soltys <soltys@....info>
To:	linux-raid@...r.kernel.org
Cc:	Bill Davidsen <davidsen@....com>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)

> 
> A very nice bit of work, my only questions is if you ever feel motivated 
> to repeat this test, it would be fun to do it with ext3 (or ext4) using 
> the stride= parameter. I did limited testing and it really seemed to 
> help, but nothing remotely as format as your test.
> 

Speaking about which, it would probably be good to adjust a little how 
the filesystem is created and mounted (both in xfs and ext3/4 cases). 
E.g. lazy-count=1 is still not the default last time I checked mkfs.xfs. 
And even ext4.txt from kernel documentation recommends mounting it with 
data=writeback,nobh when doing comparison with metadata journaling 
filesystems (the same would go for ext3).

Along with different journal sizes, keeping an eye on stripe & 
stripe-width, and other settings that might be of interest.
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