Messages in this thread | | | Date | Thu, 1 Mar 2012 09:18:23 -0500 | From | Chris Mason <> | Subject | Re: getdents - ext4 vs btrfs performance |
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On Thu, Mar 01, 2012 at 03:03:53PM +0100, Jacek Luczak wrote: > 2012/3/1 Hillf Danton <dhillf@gmail.com>: > > On Thu, Mar 1, 2012 at 9:35 PM, Jacek Luczak <difrost.kernel@gmail.com> wrote: > >> > >> 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.
> >> > >> 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
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