-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 06/02/2012 12:58 PM, Jan Ritzerfeld wrote:
Am Freitag, 1. Juni 2012, 20:20:32 schrieb Mark Goldstein:
[...] Any advice how to debug it?
IMHO, the easiest thing to do is to rule out the NTFS filesystem by trying to copy more than 500MB to the encrypted partition (assuming it is not using NTFS). Then, to rule out the encrypted but non-mounted partition by replacing it with a non-NTFS partition or by using another disk with the same layout but a non-encrypted partition.
What can slow down the write access (my impression is that reading is still OK, though I only transferred small files, so I can't say for sure)?
There are some bug reports: * writing to usb flashdisk uses too much cpu and makes system unresponsive[0] * excessive swap out due to compaction/LRU aging[1] And at least two forum threads: *OpenSuse 12.1 freezes while copying data[2] * USB drives bad performance, low speed[3]
BTW, only [3] seems to be specific to NTFS whil the other links describe system freezes resulting in slow write performance.
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. In the meantime I did a couple of additional experiments. First, I can confirm that read access is OK, as expected. 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). 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. 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. Regards, - -- Mark -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPygL2AAoJEKWTiqSclQacYF4IAK4vz63BNwvv3oJWvonqIzcG 2LHJCZ1rNqakUdHzyaAxzdnoiRbDpn7QdJaaJ9zKcb4g+E+bdUniJkAd4rQRDlH9 QxOFRyUOmWJXbixmdPx925ARL2WEgoFJ7rJuUU1BMmNiE84/zN2iGzq2q5/nZRux JdUaVqe4RhrDmWPBoVc85lrGPB9KrBql/MzeVAXZgMulfbPMZbFxYvszSolO48MB EXGw4g4kSuHvNPi/pDewtqZ/hAWszzUK27okWIF2YiaFgvtmtBBYZpLrtXY/U5jg FRPzcbvl0Rhti8ICBmy5ZCgM8Lz6pXhCJ0nKglOCAIxBbylGmMe5ApBnpLffQ2c= =iTjS -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org