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SubjectRe: [PATCH RFC] nilfs2: continuous snapshotting file system
On Thu, 21 Aug 2008 00:25:55 +0300 (MET DST)
Szabolcs Szakacsits <szaka@ntfs-3g.org> wrote:

>
> On Thu, 21 Aug 2008, Ryusuke Konishi wrote:
> > >> Some impressive benchmark results on SSD are shown in [3],
> > >
> > >heh. It wipes the floor with everything, including btrfs.
>
> It seems the benchmark was done over half year ago. It's questionable how
> relevant today the performance comparison is with actively developed file
> systems ...
>
> > >But a log-based fs will do that, initially. What will the performace
> > >look like after a month or two's usage?
> >
> > I'm using NILFS2 for my home directory for serveral months, but so far
> > I don't feel notable performance degradation.
>
> I ran compilebench on kernel 2.6.26 with freshly formatted volumes.
> The behavior of NILFS2 was interesting.
>
> Its peformance rapidly degrades to the lowest ever measured level
> (< 1 MB/s) but after a while it recovers and gives consistent numbers.
> However it's still very far from the current unstable btrfs performance.
> The results are reproducible.
>
> MB/s Runtime (s)
> ----- -----------
> btrfs unstable 17.09 572
> ext3 13.24 877
> btrfs 0.16 12.33 793
> nilfs2 2nd+ runs 11.29 674
> ntfs-3g 8.55 865
> reiserfs 8.38 966
> nilfs2 1st run 4.95 3800
> xfs 1.88 3901

err, what the heck happened to xfs? Is this usual?


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