Basil Chupin wrote:
Copying the 7.6 GB file using mc (midnight commander) to the external HDD *all* of which was in ntfs, produced a result of ~27.4MB/s transfer rate.
After I formatted the whole 2TB HDD in ext4, copying the same file using mc produced a transfer rate of ~79MB/s.
In all these trials the same internal HDDs were used, the same USB3 cable was used, the same file(s) were copied using either the CLI command 'cp', or the app 'mc', and in the very latest trials (as in earlier today and tonight) using SystemRescue CD which does not use the openSUSE 12.2 or the 12.3 kernels and whatevers.
The summary of all the results is that copying to an external USB3 device formatted in ntfs is 34% SLOWER than when copying the identical file to an ext4 formatted partition.
Now, I am nowhere close to being an expert in any field, but trying to accept that copying a file to partition formatted in ntfs as against copying to an ext4 partition incurs an overhead of 34% is just a bit too much to accept gracefully. However, as I said, I am not an expert and will accept this (even though wikipedia doesn't support this difference in speeds).
OK , taking all this into account, what can be wrong at *my* end, in my system, which could cause such a speed difference?
The bottle-neck is quite clearly in the writing to the NTFS filesystem, which means in the NTFS user-space side. I would try, as I think have suggested before, tying the mount.ntfs process to one core. It's hard to imagine switching core would cause this much of a reduction in performance, but when Greg sees much better numbers with a similar copy operation, we're running out of options. -- Per Jessen, Zürich (13.4°C) http://www.dns24.ch/ - free DNS hosting, made in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org