-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 06/02/2012 04:57 PM, Jan Ritzerfeld wrote:
Am Samstag, 2. Juni 2012, 15:11:34 schrieb Mark Goldstein:
[...] Thank you Jan, I'll try to find some hints in the bugs and discussions you referred to, though from the first glance they look different.
Yes they do. However, IMHO it is most important to reduce the complexity of your problem by ruling out the problem in these bugs and discussions. There are the references to fixes in 3.1.10-1.9.1 kernel that influence USB performance. I've checked and I have this same kernel. (desktop version).
Second, even if I mount encrypted partition (it has ReiserFS), the writing to non-encrypted one is still slow, while writing to encrypted partition itself is OK (20-30 MB/sec against 30-40 kB/sec).
You wrote similar data (wrt number of files and file size) to the encrypted partition? Yep, the same 500 Mb file.
Third, I mounted encrypted partition in 11.4 and writing to non-encrypted NTFS partition was fast (30-60 MB/sec). Looks 12.1 specific.
Thus, your general USB transfer speed is significally slower using 12.1. The speed reported by krusader was changing. Might be not very accurate. In 11.4 it looked like 60 MB/sec at the beginning, then it slowed down near the end of file. Another point is that 11.4 is 32-bit version while 12.1 is 64-bit. I would expect that since 12.1 can use more memory (the machine has 4 GB RAM) the buffering will be more effective.
I can't be 100% sure, but I think I've copied large files to this NTFS partition under 12.1 before creating encrypted ReiserFS partition, and it was OK.
I really cannot believe a partition that is not mounted would have any effect! However, is there any difference in the mount options actually used (between 11.4 and 12.1)? I'll check it next time I'll work with this disk. I did not adjust anything, just left what Yast did. My initial suspicion was that some kind of automount daemon is working in background trying to access encrypted partition. But since nothing changed after I unlocked and mounted the partition, it could be excluded.
Probably I have to try iotop and/or htop while copying. Regards, - -- Mark -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPyiQ6AAoJEKWTiqSclQaco/IIAIVERfVEbj5w577LdXtbd2kM 781UoR76w96PDHV+Zw3qMwIOzHco88EA/JOdjnf47DysG0So0+H/EC6vkWcUurkP xC5mFeDToYw5svXCa2Zi30XXTYNgINo461u86ww2ihc9yvDLP+NNG9cENOgAZ1JQ sgZBN7Sb/tH+xhMQPCLt0oZlOj3baq0ti9jYZ2945TxH6wXAMNqtzT8q9xh/o/os GNa1Cd94n2QIf8glbDFiY4k2GRuYyFQW0zoGBjpyZQoFQM7FdPUkS9nnhvNfKM6U XgyqT5W+G0AlS2rRFi6mCtO4DrI/2C1BlXq24hlBBW+X/UbM02nUEEItcXG1hmQ= =Nz+n -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org