Re: [PATCH v1 2/3] VFS permit cross device vfs_copy_file_range

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On Tue, Mar 21, 2017 at 12:03:08PM -0400, Olga Kornievskaia wrote:
> Thank you for the update. I guess I don’t see how the proposed NFS
> implementation is complicated and ugly (but I’m biased). I’ll try to
> give you some performance number. My 1 data point (1gb) inter copy
> showed 30% improvement (how can that be ignored).

That would be useful, thanks--if it comes with some details about the
setup.

I'm not so curious about percent improvement, as how to predict the
performance on a given network.

If server-to-server copy looks like it's normally able to use close to
the available bandwidth between the two servers, and if a traditional
read-write-copy loop is similarly able to use the available bandwidth,
then I can figure out whether server-to-server copy will help on my
setup.

--b.



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