I tried file copies similar to "cp --reflink" over the network (from cifs.ko client) with the new SMB3.11 dialect and FSCTL_DUPLICATE_EXTENTS. As expected - spectacularly faster than regular cp. Target file system was REFS in my tests at the SMB3 test event this week. Now that Samba is also adding SMB3.11 dialect support, looking forward to when we get this in Samba server too - it is a huge performance boost for large file copy. (The patch to cifs.ko is https://git.samba.org/?p=sfrench/cifs-2.6.git;a=commit;h=8295c91bcb9d19f8fbb8885d135321ab6d18a781) root@ubuntu:~/cifs-2.6# time cp /mnt/100MBfile /mnt/copy1 real 0m1.712s user 0m0.002s sys 0m0.840s root@ubuntu:~/cifs-2.6# time cp --reflink /mnt/100MBfile /mnt/copy2 real 0m0.026s user 0m0.001s sys 0m0.013s root@ubuntu:~/cifs-2.6# time cp --reflink /mnt/100MBfile /mnt/copy3 real 0m0.016s user 0m0.001s sys 0m0.005s -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
