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Improving XFS desktop performance?

To: xfs@xxxxxxxxxxx
Subject: Improving XFS desktop performance?
From: Pedro Ribeiro <pedrib@xxxxxxxxx>
Date: Fri, 20 Nov 2009 02:05:01 +0000
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Hi all,

I've been using XFS since 2007 and I although I'm quite happy with its
performance, I am always looking at ways to improve it.
My usage is a regular desktop machine, for software development and
web browsing.
The main performance bottleneck I have is LUKS :-) However, I really
like my data encrypted, so dissing it is not an option. Actually, I'm
the xfs improvements discussed below I was able to get the performance
hit to something like 10% - negligible for me.

So what I do is specify a 128m log on filesystem creation:
mkfs.xfs -l size=128m /dev/mapper/target

And on /etc/fstab mount it as;
/dev/mapper/target      noatime,logbufs=8,logbsize=256k

After the above, my delete speed improved drastically.

Searching around the net I was able to find that using "lazy-count=1"
on mkfs would give a performance increase - how much would that be,
enough for me to do a full backup, format with that option + 128m log
and then restore all again?
And anything else you recommend?

Thanks for your time,
Pedro

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