On Thu, Mar 01, 2012 at 03:43:41PM +0100, Jacek Luczak wrote:

2012/3/1 Chris Mason [off-list ref]:

quoted

XFS will probably beat btrfs in this test. =A0Their directory index=

es

quoted

reflect on disk layout very well.

=20
True, but not that fast on small files.
=20
Except the question I've raised in first mail there's a point in all
those action. We are maintaining host that are used for building
software: random access, lot of small files and dirs (always a co),
heavy parallel IO. We were testing XFS vs ext4 a year ago and XFS was
around 10% slower on build times. We did not - yet - done same on
btrfs. Now we're looking for replacement for ext4 as we suffer from
those issue - but we were not aware of that until stepped into this
issue.
=20
If you would like me to do some specific tests around ext4 and btrfs,
let me know.

I'm always curious to see comparisons in real world workloads.  You
should definitely consider testing XFS again, the big three filesystems
are under pretty constant improvement.  For btrfs, please stick to 3.2
kernels and higher.

This seeky backup performance is somewhat built into ext4, but as Ted
said there are a few workarounds.

-chris

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