[linux-cifs-client] can someone please explain the performance difference between mount.cifs and smbclient?

[Emmanuel Florac]

Using mount -t cifs //server/share /mnt/share between two big servers
connected with 10GigE, I've got : 115 MB/s reading, 132 MB/s writing. 
Using smbclient, I've got 450 MB/s reading, 132 MB/s writing (NFS gives
~ 260 MB/s write, 550 MB/s read on the same setup, with absolutely zero
optimisation).

Why this huge difference? BTW, why such a discrepancy between read and
write speed? 

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