On Friday 15 December 2006 23:24, Johannes Niess wrote:
Did I forget something stupid or does this also occur on your hardware? All you need is a DVD+RW medium without valuable data. You can savely abort (^C) when it takes too much time.
Just to confirm and add to the statistics - I see this behaviour too but the performance through pktcdvd is much lower even for the 32768B blocks; drive is NEC ND-4570, kernel is stock 2.6.19. With 8x DVD+RW media: # dd if=/dev/zero of=/dev/hda bs=32768 count=25000 25000+0 records in 25000+0 records out 819200000 bytes (819 MB) copied, 96.3903 seconds, 8.5 MB/s # dd if=/dev/zero of=/dev/hda bs=32769 count=25000 25000+0 records in 25000+0 records out 819225000 bytes (819 MB) copied, 772.428 seconds, 1.1 MB/s # pktsetup dvdrw /dev/hda # dd if=/dev/zero of=/dev/pktcdvd/dvdrw bs=32768 count=25000 25000+0 records in 25000+0 records out 819200000 bytes (819 MB) copied, 527.97 seconds, 1.6 MB/s # dd if=/dev/zero of=/dev/pktcdvd/dvdrw bs=32769 count=25000 25000+0 records in 25000+0 records out 819225000 bytes (819 MB) copied, 830.979 seconds, 986 kB/s # pktsetup -d dvdrw I also tried it with 5x DVD-RAM media to see what would happen: sh-3.1# dd if=/dev/zero of=/dev/hda bs=32768 count=25000 25000+0 records in 25000+0 records out 819200000 bytes (819 MB) copied, 185.128 seconds, 4.4 MB/s sh-3.1# dd if=/dev/zero of=/dev/hda bs=32769 count=25000 25000+0 records in 25000+0 records out 819225000 bytes (819 MB) copied, 974.509 seconds, 841 kB/s Stephen -- To unsubscribe, e-mail: packet-writing+unsubscribe@opensuse.org For additional commands, e-mail: packet-writing+help@opensuse.org