Re: DVD writing speed (1x!) on a Samsung TS-H552U
> Mounted Media: 1Bh, DVD+R
> Current Write Speed: 8.0x1385=11080KB/s
> Write Speed #0: 8.0x1385=11080KB/s
> growisofs stdout: 38010880/1988837376 ( 1.9%) @0.0x, remaining 36:46
> growisofs stdout: 38436864/1988837376 ( 1.9%) @0.1x, remaining 38:54
> growisofs stdout: 41549824/1988837376 ( 2.1%) @0.7x, remaining 39:03
>
> It continues varying between @0.7 and @1.2 through the entire disk record
In my experience there are 2 possibilities for this: DMA is not enabled
for the burner (hdparnm /dev/hdX to check), or a bug in the Linux kernel
causes a waste of 90% CPU time with disk accesses. The bug is triggered
by heavy disk activity. Newer kernels (SuSE at least) have some sort of
auto-recover in it, otherwise a reboot is the only fix. This bug
typically occurs with newer+faster disks on older IDE hardware.
Volker
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