On Thu, Mar 01, 2012 at 03:03:53PM +0100, Jacek Luczak wrote:

2012/3/1 Hillf Danton [off-list ref]:

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On Thu, Mar 1, 2012 at 9:35 PM, Jacek Luczak [off-list ref] wrote:

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While I was about to grab acp I've noticed seekwatcher with made my day :)

seekwatcher run of tar cf to eliminate writes (all done on 3.2.7):
1) btrfs: http://dozzie.jarowit.net/~dozzie/luczajac/tar_btrfs.png
2) ext4: http://dozzie.jarowit.net/~dozzie/luczajac/tar_ext4.png
3) both merged: http://dozzie.jarowit.net/~dozzie/luczajac/tar_btrfs_ext4.png

Whoa, seekwatcher makes it pretty clear.

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I will send acp results soon.

Would you please take reiserfs into account?

As of now not (lack of time) but I'm pretty close to consider XFS in
the game. Whenever I will have more time and there won't be a pressure
on giving host back to production I will redo same tests for reiserfs.

Now I'm focused on the userspace sorting results.

reiserfs should have results very similar to ext4.  The directory
hashing used by reiserfs is going to result in a very random read
pattern.

XFS will probably beat btrfs in this test.  Their directory indexes
reflect on disk layout very well.

-chris