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    SubjectRe: [PATCH 0/7] overlay filesystem: request for inclusion
    On Thu, Jun 09, 2011 at 11:58:37PM +0100, Anton Altaparmakov wrote:
    > > NTFS has been doing nicely in userspace for almost half a decade. It's
    > > not as fast as a kernel driver _could_ be, but it's faster than _the_
    > > kernel driver.
    >
    > Er, sorry to disappoint but the Tuxera NTFS kernel driver is faster
    > than any user space NTFS driver could ever be. It is faster than
    > ext3/4, too. (-: To give you a random example on an embedded system
    > (800MHz, 512MB RAM, 64kiB write buffer size) where NTFS in user space
    > achieves a maximum cached write throughput of ~15MiB/s, ext3 achieves
    > ~75MiB/s, ext4 ~100MiB/s and Tuxera NTFS kernel driver achieves
    > ~190MiB/s blowing ext4 out of the water by almost a factor of 2 and
    > the user space code by more than a factor of 10. File systems in user
    > space have their applications but high performance is definitely not
    > one of them... You might say that ext3/4 are journalling so not a
    > fair comparison so let me add that FAT32 achieves about 100MiB/s in
    > the same hardware/test, still about half of NTFS.

    Talk to Tuxera, they have a new version of their userspace FUSE version
    that is _much_ faster than their public one, and it might be almost as
    fast as their in-kernel version for some streaming loads (where caching
    isn't necessary or needed.)

    So it can be done, and done well, if you know what you are doing :)

    thanks,

    greg k-h


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