-----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:

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[...] 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.

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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

-----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:

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[...] 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).

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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.

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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.

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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

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2012-06-02 19:22, Mark Goldstein wrote:

Could "sync" option be the culprit? Does it mean sync after each write?

Yes. - -- Cheers / Saludos, Carlos E. R. (from 11.4 x86_64 "Celadon" at Telcontar) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.16 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk/KbbIACgkQIvFNjefEBxq9sgCgzdJrRgT//+jfjNRec2kiYEgG csoAnA1uJFRQB42ACBWk46KMynttx1dw =urtE -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2012-06-03 10:57, Jan Ritzerfeld wrote:

Am Samstag, 2. Juni 2012, 20:22:51 schrieb Mark Goldstein:

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[...] The /dev/sde1 is ntfs not encrypted partition, it is automounted in both systems. [...] Could "sync" option be the culprit? Does it mean sync after each write?

Yes, and the funny thing is: even if 11.4 did use it, it would have had no effect! The sync mount option was implemented in version 2011.1.15 and 11.4 uses 2010.10.2 AFAIK.

Huh? I've seen the effect of the sync option more than 10 years ago, in floppies. It always worked. Not that long ago (9.x?), external media like usb was automounted as sync, and they were very slow. At the time the trick was to umount and then manually mount without sync. - -- Cheers / Saludos, Carlos E. R. (from 11.4 x86_64 "Celadon" at Telcontar) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.16 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk/LSiAACgkQIvFNjefEBxqToQCgspixF126Va6pm7I9zZYmizWm qDAAoM0Ge4gEAPLPNcLzwZZhiR6F1DPB =TtSP -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

On Sun, Jun 3, 2012 at 2:27 PM, Carlos E. R. wrote:

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

On 2012-06-03 10:57, Jan Ritzerfeld wrote:

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Am Samstag, 2. Juni 2012, 20:22:51 schrieb Mark Goldstein:

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[...] The /dev/sde1 is ntfs not encrypted partition, it is automounted in both systems. [...] Could "sync" option be the culprit? Does it mean sync after each write?

Yes, and the funny thing is: even if 11.4 did use it, it would have had no effect! The sync mount option was implemented in version 2011.1.15 and 11.4 uses 2010.10.2 AFAIK.

Huh?

I've seen the effect of the sync option more than 10 years ago, in floppies. It always worked. Not that long ago (9.x?), external media like usb was automounted as sync, and they were very slow. At the time the trick was to umount and then manually mount without sync.

Jan is probably talking about NTFS-3G version? I'll check later when I'll reach the machine. I'd really like to know how this auto-mounting stuff works. It should be triggered by udev rules, I suppose, but I do not know how. Then the desktop auto-mounter should do the rest. I'm using KDE3, so I'll need to understand where and how it is defined there. It is possible that some update happened at the same time when I created encrypted partition, so this created false impression that the problem was triggered by this action. In any case, the workaround with remounting without sync option should work. I was going to try it first. Thanks & regards, -- Mark Goldstein -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

On Sun, Jun 3, 2012 at 3:12 PM, Jan Ritzerfeld wrote:

Am Sonntag, 3. Juni 2012, 14:49:32 schrieb Mark Goldstein:

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[...] I'm using KDE3, so I'll need to understand where and how it is defined there. It is possible that some update happened at the same time when I created encrypted partition, so this created false impression that the problem was triggered by this action.

Sorry, I do not know how KDE3 does its automounting today. However, there is a KDE3-specific list: opensuse-kde3. They will be very interested in such regressions.

Sure, I was going to see how it works in KDE4 (also installed) and if it'll turn out to be KDE3 specific, I'll ask on kde3 list. One difference I'm aware of is that KDE3 in 11.4 uses hald, while in 12.1 it does not. Thanks again, -- Mark Goldstein -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org