As expected initial performance tests of cp --reflink show a big improvement To localhost, Samba master branch on btrfs Fedora 19. 2.2GB file copied in 12.1 seconds without reflink over an SMB3 mount from the kernel client but took only 1.3 seconds with --reflink (with the new cp --reflink patches) To a windows 8.1 server I tried a few examples. 27MB file copy wias over a 100 times faster (over my usual Wifi connection between machines) [sfrench@w530-smf cifs-2.6]$ time cp /mnt/Steven/Documents/27meg /mnt/Steven/Documents/27megnorefcopy real 0m14.529s user 0m0.002s sys 0m0.101s [sfrench@w530-smf cifs-2.6]$ time cp --reflink /mnt/Steven/Documents/27meg /mnt/Steven/Documents/27megrefcopy real 0m0.132s user 0m0.000s sys 0m0.005s For a 200MB file relatively performance was even better for reflink [sfrench@w530-smf Documents]$ time cp file.txt file-no-reflink.txt real 1m36.184s user 0m0.009s sys 0m0.409s [sfrench@w530-smf Documents]$ time cp --reflink file.txt file-reflink.txt real 0m0.510s user 0m0.003s sys 0m0.024s -- 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
