March 2005 - Packet Writing - openSUSE Mailing Lists

selecting the right patch and kernel source pairs
by Gabor Istvan 28 Mar '05

28 Mar '05

Dear list members: Currently I am using Suse 9.2 with its default kernel 2.6.8-24.11-default on a PC box. I would like to try packet-writing. I looked at http://web. telia.com/~u89404340/patches/packet/2.6/ for the available patches. My questions are: 1. Can I use the default suse kernel sources to patch or I do I have to use vanilla kernel? 2. If I can use the suse default kernel which patch should I apply for the kernel mentioned above? Thanks for the help, IG

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DVD recorder and udftools
by Paul Smith 12 Mar '05

12 Mar '05

Dear All I have just bought a DVD recorder. Can I use udftools with it? If so, how? Thanks in advance, Paul

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2.4 -> 2.6 change: mount with disk not in drive semantics changed to something silly
by Nix 07 Mar '05

07 Mar '05

In the Linux 2.4 packet-writing patches, if you tried mounting a packet-written CD when there was a disk in the drive but the drive was ejected, it pulled the drive in and mounted it. This is sane behaviour, I think. In 2.6, that's changed: the first time you try to mount, you get mount: /dev/pktcdvd/cdrw: can't read superblock and the *second* time it works. This, to put it mildly, inconsistent behaviour leads to insanity like the following kludge in my backup scripts: if ! mount /mnt/pcdrw 2>/dev/null && ! mount /mnt/pcdrw 2>/dev/null; then ... check and format the CD-RW ... fi I imagine this is a bug. Right? -- > ...Hires Root Beer... What we need these days is a stable, fast, anti-aliased root beer with dynamic shading. Not that you can let just anybody have root. --- John M. Ford

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Looking for a more efficient format command
by Paul Smith 06 Mar '05

06 Mar '05

Dear All I use the following command to format a 700MB cdrw: cdrwtool -d /dev/hdc -q but, after formatting, I get only 576MB of capacity. Is there another command to get greater capacity? Thanks in advance, Paul

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Data corruption with pktcdvd, kernel 2.6.10
by Paul 01 Mar '05

01 Mar '05

Hi; I have played with the pktcdvd patch in the past, and most recently with the implementation in the 2.6.10 kernel, but never really stressed it. However, someone recently complained to me that it quite often resulted in corrupted files for them, so I performed a stress test; copy a kernel source tree to a cdrw and a dvd+rw. (mount /dev/pktcdvd/cdrw /cdrw -o rw,noatime) (cp -a /foo/2.6.10 /cdrw) Well, diff -r shows many corrupt files in both cases. The corruption is either that the file is completely zero, or at some point it ends in zero data. In other words, all or part of the file end up as zero's. Simpler tests, like copying a flat dir filled with 50meg of images did not turn up corruption. I would have liked to compare writing to dvd+rw without pktcdvd, but although I could make a udf fs on the disc, mount it and start writing to it, the throughput was impossibly slow. (like 1meg in several minutes-- at best.) Using pktcdvd was much faster, but it seems to bog down after a while into the kernel tree copy-- and if you look at the drive light, it seems to be doing lots of reading and then little blips of writing. 'vmstat 1' shows very little bi/bo, often times 0/0. Can anyone suggest what might be done to find out what is going wrong here? I am using vanilla 2.6.10, udftools-1.0.0b-r3, a liteon LDW-451S dvd writer. The kernel is SMP with preempt enabled. The writer and the hardisc are both ATA. Let me know if I can help with more information or testing. Thanks; Paul set(a)pobox.com

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