On Tue, 29 Jul 2008, Theodore Tso wrote:
> On Tue, Jul 29, 2008 at 10:52:26PM +0000, Szabolcs Szakacsits wrote:
> > I did also an in memory test on a T9300@xxx, with disk I/O completely
> > eliminated. Results:
> >
> > tmpfs: 975 MB/sec
> > ntfs-3g: 889 MB/sec (note, this FUSE driver is not optimized yet)
> > ext3: 675 MB/sec
>
> Am I write in guessing that this test involved copying a single large
> file, with no seeks?
Yes, it was writing a large file on a newly created, loop mounted image
file.
> What happens if you try benchmarking unpacking a kernel source tar.bz2
> file? My guess is that ntfs-3g won't look as good. :-)
It seems the tar.bz2 number is not so bad relatively but the metadata
performance difference is much more visible by eliminating the compression
overhead. The results are in second.
ext3 ntfs-3g
tar.bz2 7.7 12.4
tar.gz 3.1 8.7
tar 1.4 7.6
A few seconds could be improved but I think getting similar numbers will
need major FUSE changes and non-trivial work to get rid of most contexts
switches which indeed seem to be the bottleneck according to the profiling
data.
Szaka
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NTFS-3G: http://ntfs-3g.org
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